B1315

Code

Other B — Body

Battery Saver Relay Coil Circuit Short To Battery

Brand: Other

Type: B — Body

Views: UK: 30 EN: 67 RU: 67

AI status

Completed

ready

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Page language: EN

Causes

Damaged insulation or chafed wiring shorting the relay control wire to battery feed
Failed battery saver relay internally shorted to battery
Corroded/contaminated connector or pin making unintended battery contact
Aftermarket device or improper splice accidentally tied to battery feed
Faulty body control module (BCM) or relay driver with internal short to battery
Water intrusion in connector or harness causing conductive path to battery

Symptoms

Accessory circuits remain powered with key off or battery saver functions inoperative
Parasitic battery drain or dead battery after vehicle sits
Battery saver relay remains energized/stuck closed
Fuses blowing on permanent battery feed circuits
Body electrical warnings, DTC present pointing to body/relay circuit

What to check

Inspect relay and nearby wiring for damage, melted insulation, contamination or aftermarket splices
Visually inspect relay socket and connector pins for corrosion, bridging, heat damage
Check fuses and fusible links on the battery feed to the relay for signs of damage
Remove the battery saver relay and observe whether symptoms (accessory off, battery drain stops) change
With ignition off, backprobe the relay coil feed and control terminals and measure voltage
Measure coil resistance (relay removed) across coil terminals and compare to specification

Signal parameters

Constant feed (battery) to relay coil: ~11–14 V (vehicle off or on, depending on design)
Relay coil resistance (typical range): ~20–200 ohms (vehicle-dependent; consult spec)
Control/driver terminal with circuit healthy: should not show battery voltage with ignition off — often low or high-impedance until commanded
Failure condition (short to battery): control terminal reads ~11–14 V with ignition off

Diagnostic algorithm

Verify code and capture freeze-frame / scan tool data. Note related codes and battery voltage. 2) Visually inspect relay, relay socket and wiring for damage, corrosion, melted insulation or aftermarket splices. 3) Remove the battery saver relay: if accessories turn off and battery drain stops, fault is in relay or supply wiring; if not, fault is upstream. 4) With ignition off, backprobe the relay connector: identify coil constant feed terminal and control/driver terminal. Measure voltage on both. Control terminal reading ~11–14 V with key off indicates short to battery. 5) Unplug connectors sequentially upstream (inline connectors, BCM connector) while monitoring the control terminal to locate the section where battery voltage disappears. 6) With relay removed, measure coil resistance across the coil pins; compare to spec. A near-zero reading indicates internal short. 7) If wiring short is suspected, perform a resistance/continuity test between the control circuit and battery positive with ignition off to confirm short. 8) Repair identified wiring damage, replace corroded connectors, or replace the relay. If control circuit still tied to battery after isolating wiring and relay, test/replace the BCM/relay driver. 9) Clear codes and re-check for reoccurrence and proper operation. Retest parasitic draw if battery drain was present.
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Likely causes

Chafed/damaged wiring at harness-to-chassis routes or near relay mounting
Shorted or internally failed relay
Connector corrosion or bent pins at relay or BCM
Aftermarket accessory spliced into relay feed or control conductor

Fault status

⚠️ Status

Active/current electrical fault: Battery Saver Relay coil control circuit has a short to battery. Relay may be energized continuously causing accessory retention or battery drain. Inspection of relay, wiring, connectors and body control module recommended.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours