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Home / DTC / B1302 — Accessory timer relay circuit

B1302 — Accessory timer relay circuit

Detailed page for trouble code B1302.

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B1302

ALFA ROMEO B — Body

Accessory timer relay circuit

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 7 EN: 16 RU: 5
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse supplying accessory/timer relay
  • Failed accessory timer relay (stuck open or closed)
  • Open, short, or high-resistance wiring in the relay supply, control, or ground circuit
  • Corroded or loose relay connector or wiring terminals
  • Faulty body control module / timer module output
  • Water ingress or damage to connector or relay

Symptoms

  • Accessories (radio, windows, interior lights, etc.) do not remain powered as expected after ignition-off
  • Accessories do not operate when they should or operate intermittently
  • Accessory unit(s) fail to turn on at all
  • Possible battery drain if relay is stuck closed
  • Related warning or information messages on dash
  • DTC B1302 stored and may be accompanied by other body electrical codes

What to check

  • Read and record all stored codes and freeze-frame data with a scan tool
  • Check battery voltage (should be ~12–14.5 V) and charging system condition
  • Inspect fuses related to accessory/timer circuits for proper rating and continuity
  • Visually inspect relay, relay socket, and wiring for corrosion, damage or loose connectors
  • Check for obvious water ingress or physical damage at relay and module connectors
  • Using a scan tool or data list, monitor the accessory timer output/status while operating relevant functions

Signal parameters

  • Supply voltage to relay: should be battery voltage (approx. 11–14.5 V) with key on and when timer feeds are active
  • Control signal from control module: either switched to ground or switched 12 V depending on design; should appear when timer is commanded
  • Relay coil continuity: typically low ohms (tens to a few hundred ohms) — should show continuity, not infinite or very high resistance
  • Ground: low resistance to chassis ground at relay/connector (near 0 Ω)
  • No-load contact side: when relay energized, switched output should present battery voltage to accessory circuits

Diagnostic algorithm

  1. Connect a diagnostic scanner, record B1302 and any other codes, then view live data related to the accessory timer/relay output.
  2. Verify battery voltage and ensure good battery state. Low battery can cause spurious body module faults.
  3. Locate accessory timer relay and associated fuses; perform visual inspection of relay, socket, wiring, and connectors for damage or corrosion.
  4. Check related fuse(s) for continuity and correct rating; replace blown fuses only after finding the root cause.
  5. With ignition in the appropriate position and accessories commanded, measure supply voltage at the relay power pin — should be battery voltage.
  6. Command the accessory timer (or simulate conditions) and observe the control signal at the relay coil control pin: verify it switches (to ground or +12 V) as expected.
  7. Measure coil resistance with relay removed: expect low ohms (continuity). If open or out of range, bench-test or swap relay with identical known-good relay.
  8. Check continuity between relay output and accessory loads, and continuity of ground circuit; repair any open/shorts found.
  9. If wiring and relay test good but control signal is absent or abnormal, check output driver at the control module connector for shorts to power or ground. Perform module connector pin inspection and wiggle tests to reproduce fault.
  10. If module output is faulty, confirm with manufacturer-specific module tests before replacing the control module. Replace relay/repair wiring as necessary.
  11. After repairs, clear codes, cycle ignition and perform a functional test and road/soak test to ensure intermittent faults do not recur.

Likely causes

  • Blown 12V fuse in accessory/timer feed
  • Accessory timer relay coil or contacts failed
  • Broken or chafed wire between relay and control module or battery
  • Connector pins corroded, bent, or not seated
  • Control module driver transistor for the relay is open or shorted
  • Intermittent failure caused by moisture in the relay housing

Fault status

⚠️ Status
Accessory timer relay circuit fault detected. The body/timer control unit reports abnormal voltage, open/short, or unexpected state on the accessory timer relay circuit. Convenience functions controlled by the timer may not operate correctly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1300 B1301 B1303 B1310 B1320
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Code

B1302

FIAT B — Body

Accessory timer relay circuit

Brand: FIAT
Type: B — Body
Views: UK: 5 EN: 13 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse supplying accessory/timer relay
  • Failed accessory timer relay (stuck open or closed)
  • Open, short, or high-resistance wiring in the relay supply, control, or ground circuit
  • Corroded or loose relay connector or wiring terminals
  • Faulty body control module / timer module output
  • Water ingress or damage to connector or relay

Symptoms

  • Accessories (radio, windows, interior lights, etc.) do not remain powered as expected after ignition-off
  • Accessories do not operate when they should or operate intermittently
  • Accessory unit(s) fail to turn on at all
  • Possible battery drain if relay is stuck closed
  • Related warning or information messages on dash
  • DTC B1302 stored and may be accompanied by other body electrical codes

What to check

  • Read and record all stored codes and freeze-frame data with a scan tool
  • Check battery voltage (should be ~12–14.5 V) and charging system condition
  • Inspect fuses related to accessory/timer circuits for proper rating and continuity
  • Visually inspect relay, relay socket, and wiring for corrosion, damage or loose connectors
  • Check for obvious water ingress or physical damage at relay and module connectors
  • Using a scan tool or data list, monitor the accessory timer output/status while operating relevant functions

Signal parameters

  • Supply voltage to relay: should be battery voltage (approx. 11–14.5 V) with key on and when timer feeds are active
  • Control signal from control module: either switched to ground or switched 12 V depending on design; should appear when timer is commanded
  • Relay coil continuity: typically low ohms (tens to a few hundred ohms) — should show continuity, not infinite or very high resistance
  • Ground: low resistance to chassis ground at relay/connector (near 0 Ω)
  • No-load contact side: when relay energized, switched output should present battery voltage to accessory circuits

Diagnostic algorithm

  1. Connect a diagnostic scanner, record B1302 and any other codes, then view live data related to the accessory timer/relay output.
  2. Verify battery voltage and ensure good battery state. Low battery can cause spurious body module faults.
  3. Locate accessory timer relay and associated fuses; perform visual inspection of relay, socket, wiring, and connectors for damage or corrosion.
  4. Check related fuse(s) for continuity and correct rating; replace blown fuses only after finding the root cause.
  5. With ignition in the appropriate position and accessories commanded, measure supply voltage at the relay power pin — should be battery voltage.
  6. Command the accessory timer (or simulate conditions) and observe the control signal at the relay coil control pin: verify it switches (to ground or +12 V) as expected.
  7. Measure coil resistance with relay removed: expect low ohms (continuity). If open or out of range, bench-test or swap relay with identical known-good relay.
  8. Check continuity between relay output and accessory loads, and continuity of ground circuit; repair any open/shorts found.
  9. If wiring and relay test good but control signal is absent or abnormal, check output driver at the control module connector for shorts to power or ground. Perform module connector pin inspection and wiggle tests to reproduce fault.
  10. If module output is faulty, confirm with manufacturer-specific module tests before replacing the control module. Replace relay/repair wiring as necessary.
  11. After repairs, clear codes, cycle ignition and perform a functional test and road/soak test to ensure intermittent faults do not recur.

Likely causes

  • Blown 12V fuse in accessory/timer feed
  • Accessory timer relay coil or contacts failed
  • Broken or chafed wire between relay and control module or battery
  • Connector pins corroded, bent, or not seated
  • Control module driver transistor for the relay is open or shorted
  • Intermittent failure caused by moisture in the relay housing

Fault status

⚠️ Status
Accessory timer relay circuit fault detected. The body/timer control unit reports abnormal voltage, open/short, or unexpected state on the accessory timer relay circuit. Convenience functions controlled by the timer may not operate correctly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1300 B1301 B1303 B1310 B1320
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Keep it short and practical. Up to 500 characters.
Send to email
Code

B1302

MITSUBISHI B — Body

5bow sensor:L=ON/R=OFF

Brand: MITSUBISHI
Type: B — Body
Views: UK: 9 EN: 28 RU: 9
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse supplying accessory/timer relay
  • Failed accessory timer relay (stuck open or closed)
  • Open, short, or high-resistance wiring in the relay supply, control, or ground circuit
  • Corroded or loose relay connector or wiring terminals
  • Faulty body control module / timer module output
  • Water ingress or damage to connector or relay

Symptoms

  • Accessories (radio, windows, interior lights, etc.) do not remain powered as expected after ignition-off
  • Accessories do not operate when they should or operate intermittently
  • Accessory unit(s) fail to turn on at all
  • Possible battery drain if relay is stuck closed
  • Related warning or information messages on dash
  • DTC B1302 stored and may be accompanied by other body electrical codes

What to check

  • Read and record all stored codes and freeze-frame data with a scan tool
  • Check battery voltage (should be ~12–14.5 V) and charging system condition
  • Inspect fuses related to accessory/timer circuits for proper rating and continuity
  • Visually inspect relay, relay socket, and wiring for corrosion, damage or loose connectors
  • Check for obvious water ingress or physical damage at relay and module connectors
  • Using a scan tool or data list, monitor the accessory timer output/status while operating relevant functions

Signal parameters

  • Supply voltage to relay: should be battery voltage (approx. 11–14.5 V) with key on and when timer feeds are active
  • Control signal from control module: either switched to ground or switched 12 V depending on design; should appear when timer is commanded
  • Relay coil continuity: typically low ohms (tens to a few hundred ohms) — should show continuity, not infinite or very high resistance
  • Ground: low resistance to chassis ground at relay/connector (near 0 Ω)
  • No-load contact side: when relay energized, switched output should present battery voltage to accessory circuits

Diagnostic algorithm

  1. Connect a diagnostic scanner, record B1302 and any other codes, then view live data related to the accessory timer/relay output.
  2. Verify battery voltage and ensure good battery state. Low battery can cause spurious body module faults.
  3. Locate accessory timer relay and associated fuses; perform visual inspection of relay, socket, wiring, and connectors for damage or corrosion.
  4. Check related fuse(s) for continuity and correct rating; replace blown fuses only after finding the root cause.
  5. With ignition in the appropriate position and accessories commanded, measure supply voltage at the relay power pin — should be battery voltage.
  6. Command the accessory timer (or simulate conditions) and observe the control signal at the relay coil control pin: verify it switches (to ground or +12 V) as expected.
  7. Measure coil resistance with relay removed: expect low ohms (continuity). If open or out of range, bench-test or swap relay with identical known-good relay.
  8. Check continuity between relay output and accessory loads, and continuity of ground circuit; repair any open/shorts found.
  9. If wiring and relay test good but control signal is absent or abnormal, check output driver at the control module connector for shorts to power or ground. Perform module connector pin inspection and wiggle tests to reproduce fault.
  10. If module output is faulty, confirm with manufacturer-specific module tests before replacing the control module. Replace relay/repair wiring as necessary.
  11. After repairs, clear codes, cycle ignition and perform a functional test and road/soak test to ensure intermittent faults do not recur.

Likely causes

  • Blown 12V fuse in accessory/timer feed
  • Accessory timer relay coil or contacts failed
  • Broken or chafed wire between relay and control module or battery
  • Connector pins corroded, bent, or not seated
  • Control module driver transistor for the relay is open or shorted
  • Intermittent failure caused by moisture in the relay housing

Fault status

⚠️ Status
Accessory timer relay circuit fault detected. The body/timer control unit reports abnormal voltage, open/short, or unexpected state on the accessory timer relay circuit. Convenience functions controlled by the timer may not operate correctly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1300 B1301 B1303 B1310 B1320
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1302

Other B — Body

Accessory Delay Relay Coil Circuit Failure

Brand: Other
Type: B — Body
Views: UK: 16 EN: 46 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse supplying accessory/timer relay
  • Failed accessory timer relay (stuck open or closed)
  • Open, short, or high-resistance wiring in the relay supply, control, or ground circuit
  • Corroded or loose relay connector or wiring terminals
  • Faulty body control module / timer module output
  • Water ingress or damage to connector or relay

Symptoms

  • Accessories (radio, windows, interior lights, etc.) do not remain powered as expected after ignition-off
  • Accessories do not operate when they should or operate intermittently
  • Accessory unit(s) fail to turn on at all
  • Possible battery drain if relay is stuck closed
  • Related warning or information messages on dash
  • DTC B1302 stored and may be accompanied by other body electrical codes

What to check

  • Read and record all stored codes and freeze-frame data with a scan tool
  • Check battery voltage (should be ~12–14.5 V) and charging system condition
  • Inspect fuses related to accessory/timer circuits for proper rating and continuity
  • Visually inspect relay, relay socket, and wiring for corrosion, damage or loose connectors
  • Check for obvious water ingress or physical damage at relay and module connectors
  • Using a scan tool or data list, monitor the accessory timer output/status while operating relevant functions

Signal parameters

  • Supply voltage to relay: should be battery voltage (approx. 11–14.5 V) with key on and when timer feeds are active
  • Control signal from control module: either switched to ground or switched 12 V depending on design; should appear when timer is commanded
  • Relay coil continuity: typically low ohms (tens to a few hundred ohms) — should show continuity, not infinite or very high resistance
  • Ground: low resistance to chassis ground at relay/connector (near 0 Ω)
  • No-load contact side: when relay energized, switched output should present battery voltage to accessory circuits

Diagnostic algorithm

  1. Connect a diagnostic scanner, record B1302 and any other codes, then view live data related to the accessory timer/relay output.
  2. Verify battery voltage and ensure good battery state. Low battery can cause spurious body module faults.
  3. Locate accessory timer relay and associated fuses; perform visual inspection of relay, socket, wiring, and connectors for damage or corrosion.
  4. Check related fuse(s) for continuity and correct rating; replace blown fuses only after finding the root cause.
  5. With ignition in the appropriate position and accessories commanded, measure supply voltage at the relay power pin — should be battery voltage.
  6. Command the accessory timer (or simulate conditions) and observe the control signal at the relay coil control pin: verify it switches (to ground or +12 V) as expected.
  7. Measure coil resistance with relay removed: expect low ohms (continuity). If open or out of range, bench-test or swap relay with identical known-good relay.
  8. Check continuity between relay output and accessory loads, and continuity of ground circuit; repair any open/shorts found.
  9. If wiring and relay test good but control signal is absent or abnormal, check output driver at the control module connector for shorts to power or ground. Perform module connector pin inspection and wiggle tests to reproduce fault.
  10. If module output is faulty, confirm with manufacturer-specific module tests before replacing the control module. Replace relay/repair wiring as necessary.
  11. After repairs, clear codes, cycle ignition and perform a functional test and road/soak test to ensure intermittent faults do not recur.

Likely causes

  • Blown 12V fuse in accessory/timer feed
  • Accessory timer relay coil or contacts failed
  • Broken or chafed wire between relay and control module or battery
  • Connector pins corroded, bent, or not seated
  • Control module driver transistor for the relay is open or shorted
  • Intermittent failure caused by moisture in the relay housing

Fault status

⚠️ Status
Accessory timer relay circuit fault detected. The body/timer control unit reports abnormal voltage, open/short, or unexpected state on the accessory timer relay circuit. Convenience functions controlled by the timer may not operate correctly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1300 B1301 B1303 B1310 B1320
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Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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