Code
B1459
LAND ROVER
B — Body
Relay coil of the washer pump motor / windshield wiper - open circuit
Views:
UK: 3
EN: 5
RU: 4
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the relay coil circuit
- Failed (open) relay coil
- Poor or corroded connector at the relay or ground
- Blown or missing fuse in the circuit feeding the relay coil
- Faulty body control module (BCM) / relay driver (less common)
Symptoms
- Washer pump does not operate when switch is pressed
- Windshield wipers may not operate (if same relay is used)
- Intermittent or no response from washer/wiper controls
- Related dashboard message or lamp may illuminate
- Stored B1459 fault code and possibly related codes
What to check
- Retrieve fault codes and freeze frame data with a diagnostic scanner
- Visually inspect relay, socket, fuse(s) and harness for damage or corrosion
- Check for presence and condition of related fuses
- Swap relay with an identical known-good relay (if available) and re-test
- Measure voltage and continuity at relay socket with control activated
Signal parameters
- Nominal relay coil supply: ~12 V when relay driver supplies power (vehicle battery voltage)
- Relay coil resistance (typical): ~50–200 ohms (manufacturer-specific)
- Control signal type: switched positive or switched ground from BCM (verify vehicle-specific)
- Expected voltage at coil control pin when activated: ~12 V (or near 0 V if switched to ground)
- No continuity (infinite ohms) across coil terminals indicates open coil
Diagnostic algorithm
- Confirm the B1459 code and note any additional related codes. Clear codes and attempt to reproduce the fault.
- Check fuses for the washer/wiper relay circuits; replace any blown fuses and retest.
- Locate the washer pump/wiper relay and visually inspect relay and socket for corrosion, bent pins, or water ingress. Secure any loose connections.
- Swap the suspect relay with an identical, known-good relay from the vehicle (e.g., a non-critical circuit) and check whether the function is restored and the code clears.
- If swapping is inconclusive, remove the relay and measure coil resistance with an ohmmeter across the coil pins. An open reading (OL/infinite) indicates a failed relay coil — replace relay.
- With the relay unplugged, use a lab scope or multimeter to check for the correct control voltage at the relay socket while operating the washer/wiper switch. Verify whether the BCM is commanding the relay.
- Perform continuity checks between the relay socket and the BCM/ground point to find open wires or poor connections. Repair or repair/replace damaged wiring or connectors.
- After repairs, reassemble, clear codes, and cycle the washer/wiper system multiple times to confirm no return of the fault and that operation is normal.
- If wiring, relay and fuses are good but no control signal is present, investigate the BCM/relay driver circuit or consult manufacturer guidance for module-level diagnostics.
Likely causes
- Relay coil has failed (open winding)
- Corroded or disconnected relay socket terminal
- Broken conductor between module and relay socket (pin or splice failure)
- Blown fuse supplying relay coil
- Intermittent connection due to water ingress or damaged insulation
Fault status
Status
Open circuit detected in relay coil for washer pump motor / windshield wiper. Check relay, fuse, wiring and module connections (B1459).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1459
MERCEDES-BENZ
B — Body
Series interface (K2) connection to instrument cluster (A1)
Views:
UK: 3
EN: 9
RU: 9
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the relay coil circuit
- Failed (open) relay coil
- Poor or corroded connector at the relay or ground
- Blown or missing fuse in the circuit feeding the relay coil
- Faulty body control module (BCM) / relay driver (less common)
Symptoms
- Washer pump does not operate when switch is pressed
- Windshield wipers may not operate (if same relay is used)
- Intermittent or no response from washer/wiper controls
- Related dashboard message or lamp may illuminate
- Stored B1459 fault code and possibly related codes
What to check
- Retrieve fault codes and freeze frame data with a diagnostic scanner
- Visually inspect relay, socket, fuse(s) and harness for damage or corrosion
- Check for presence and condition of related fuses
- Swap relay with an identical known-good relay (if available) and re-test
- Measure voltage and continuity at relay socket with control activated
Signal parameters
- Nominal relay coil supply: ~12 V when relay driver supplies power (vehicle battery voltage)
- Relay coil resistance (typical): ~50–200 ohms (manufacturer-specific)
- Control signal type: switched positive or switched ground from BCM (verify vehicle-specific)
- Expected voltage at coil control pin when activated: ~12 V (or near 0 V if switched to ground)
- No continuity (infinite ohms) across coil terminals indicates open coil
Diagnostic algorithm
- Confirm the B1459 code and note any additional related codes. Clear codes and attempt to reproduce the fault.
- Check fuses for the washer/wiper relay circuits; replace any blown fuses and retest.
- Locate the washer pump/wiper relay and visually inspect relay and socket for corrosion, bent pins, or water ingress. Secure any loose connections.
- Swap the suspect relay with an identical, known-good relay from the vehicle (e.g., a non-critical circuit) and check whether the function is restored and the code clears.
- If swapping is inconclusive, remove the relay and measure coil resistance with an ohmmeter across the coil pins. An open reading (OL/infinite) indicates a failed relay coil — replace relay.
- With the relay unplugged, use a lab scope or multimeter to check for the correct control voltage at the relay socket while operating the washer/wiper switch. Verify whether the BCM is commanding the relay.
- Perform continuity checks between the relay socket and the BCM/ground point to find open wires or poor connections. Repair or repair/replace damaged wiring or connectors.
- After repairs, reassemble, clear codes, and cycle the washer/wiper system multiple times to confirm no return of the fault and that operation is normal.
- If wiring, relay and fuses are good but no control signal is present, investigate the BCM/relay driver circuit or consult manufacturer guidance for module-level diagnostics.
Likely causes
- Relay coil has failed (open winding)
- Corroded or disconnected relay socket terminal
- Broken conductor between module and relay socket (pin or splice failure)
- Blown fuse supplying relay coil
- Intermittent connection due to water ingress or damaged insulation
Fault status
Status
Open circuit detected in relay coil for washer pump motor / windshield wiper. Check relay, fuse, wiring and module connections (B1459).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1459
MITSUBISHI
B — Body
RL side impact sensor No COM.
Views:
UK: 4
EN: 8
RU: 6
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the relay coil circuit
- Failed (open) relay coil
- Poor or corroded connector at the relay or ground
- Blown or missing fuse in the circuit feeding the relay coil
- Faulty body control module (BCM) / relay driver (less common)
Symptoms
- Washer pump does not operate when switch is pressed
- Windshield wipers may not operate (if same relay is used)
- Intermittent or no response from washer/wiper controls
- Related dashboard message or lamp may illuminate
- Stored B1459 fault code and possibly related codes
What to check
- Retrieve fault codes and freeze frame data with a diagnostic scanner
- Visually inspect relay, socket, fuse(s) and harness for damage or corrosion
- Check for presence and condition of related fuses
- Swap relay with an identical known-good relay (if available) and re-test
- Measure voltage and continuity at relay socket with control activated
Signal parameters
- Nominal relay coil supply: ~12 V when relay driver supplies power (vehicle battery voltage)
- Relay coil resistance (typical): ~50–200 ohms (manufacturer-specific)
- Control signal type: switched positive or switched ground from BCM (verify vehicle-specific)
- Expected voltage at coil control pin when activated: ~12 V (or near 0 V if switched to ground)
- No continuity (infinite ohms) across coil terminals indicates open coil
Diagnostic algorithm
- Confirm the B1459 code and note any additional related codes. Clear codes and attempt to reproduce the fault.
- Check fuses for the washer/wiper relay circuits; replace any blown fuses and retest.
- Locate the washer pump/wiper relay and visually inspect relay and socket for corrosion, bent pins, or water ingress. Secure any loose connections.
- Swap the suspect relay with an identical, known-good relay from the vehicle (e.g., a non-critical circuit) and check whether the function is restored and the code clears.
- If swapping is inconclusive, remove the relay and measure coil resistance with an ohmmeter across the coil pins. An open reading (OL/infinite) indicates a failed relay coil — replace relay.
- With the relay unplugged, use a lab scope or multimeter to check for the correct control voltage at the relay socket while operating the washer/wiper switch. Verify whether the BCM is commanding the relay.
- Perform continuity checks between the relay socket and the BCM/ground point to find open wires or poor connections. Repair or repair/replace damaged wiring or connectors.
- After repairs, reassemble, clear codes, and cycle the washer/wiper system multiple times to confirm no return of the fault and that operation is normal.
- If wiring, relay and fuses are good but no control signal is present, investigate the BCM/relay driver circuit or consult manufacturer guidance for module-level diagnostics.
Likely causes
- Relay coil has failed (open winding)
- Corroded or disconnected relay socket terminal
- Broken conductor between module and relay socket (pin or splice failure)
- Blown fuse supplying relay coil
- Intermittent connection due to water ingress or damaged insulation
Fault status
Status
Open circuit detected in relay coil for washer pump motor / windshield wiper. Check relay, fuse, wiring and module connections (B1459).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
B1459
Other
B — Body
Wiper Washer Pump Motor Relay Coil Circuit Open
Views:
UK: 13
EN: 20
RU: 15
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the relay coil circuit
- Failed (open) relay coil
- Poor or corroded connector at the relay or ground
- Blown or missing fuse in the circuit feeding the relay coil
- Faulty body control module (BCM) / relay driver (less common)
Symptoms
- Washer pump does not operate when switch is pressed
- Windshield wipers may not operate (if same relay is used)
- Intermittent or no response from washer/wiper controls
- Related dashboard message or lamp may illuminate
- Stored B1459 fault code and possibly related codes
What to check
- Retrieve fault codes and freeze frame data with a diagnostic scanner
- Visually inspect relay, socket, fuse(s) and harness for damage or corrosion
- Check for presence and condition of related fuses
- Swap relay with an identical known-good relay (if available) and re-test
- Measure voltage and continuity at relay socket with control activated
Signal parameters
- Nominal relay coil supply: ~12 V when relay driver supplies power (vehicle battery voltage)
- Relay coil resistance (typical): ~50–200 ohms (manufacturer-specific)
- Control signal type: switched positive or switched ground from BCM (verify vehicle-specific)
- Expected voltage at coil control pin when activated: ~12 V (or near 0 V if switched to ground)
- No continuity (infinite ohms) across coil terminals indicates open coil
Diagnostic algorithm
- Confirm the B1459 code and note any additional related codes. Clear codes and attempt to reproduce the fault.
- Check fuses for the washer/wiper relay circuits; replace any blown fuses and retest.
- Locate the washer pump/wiper relay and visually inspect relay and socket for corrosion, bent pins, or water ingress. Secure any loose connections.
- Swap the suspect relay with an identical, known-good relay from the vehicle (e.g., a non-critical circuit) and check whether the function is restored and the code clears.
- If swapping is inconclusive, remove the relay and measure coil resistance with an ohmmeter across the coil pins. An open reading (OL/infinite) indicates a failed relay coil — replace relay.
- With the relay unplugged, use a lab scope or multimeter to check for the correct control voltage at the relay socket while operating the washer/wiper switch. Verify whether the BCM is commanding the relay.
- Perform continuity checks between the relay socket and the BCM/ground point to find open wires or poor connections. Repair or repair/replace damaged wiring or connectors.
- After repairs, reassemble, clear codes, and cycle the washer/wiper system multiple times to confirm no return of the fault and that operation is normal.
- If wiring, relay and fuses are good but no control signal is present, investigate the BCM/relay driver circuit or consult manufacturer guidance for module-level diagnostics.
Likely causes
- Relay coil has failed (open winding)
- Corroded or disconnected relay socket terminal
- Broken conductor between module and relay socket (pin or splice failure)
- Blown fuse supplying relay coil
- Intermittent connection due to water ingress or damaged insulation
Fault status
Status
Open circuit detected in relay coil for washer pump motor / windshield wiper. Check relay, fuse, wiring and module connections (B1459).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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