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Home / DTC / B1400 — Driver Power Window One Touch Window Relay Circuit Short To Battery

B1400 — Driver Power Window One Touch Window Relay Circuit Short To Battery

Detailed page for trouble code B1400.

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Code

B1400

Other B — Body

Driver Power Window One Touch Window Relay Circuit Short To Battery

Brand: Other
Type: B — Body
Views: UK: 18 EN: 30 RU: 22
AI status
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Page language: EN

Causes

  • Damaged insulation or chafed wiring in the driver door harness contacting battery (+) circuit
  • Shorted relay contacts or internal relay failure
  • Faulty power window switch (stuck or internally shorted)
  • Corrosion or water intrusion in door connector or switch assembly
  • Failed body control module (BCM) or relay driver transistor
  • Incorrect previous repair or aftermarket accessory tied into window power circuit

Symptoms

  • One-touch up/down function does not operate or behaves erratically
  • Window moves continuously or operates without pressing the switch
  • Blown fuse(s) for power windows or repeated relay clicks
  • Battery drain when vehicle is off (if short persists)
  • Related body electrical faults or stored BCM codes

What to check

  • Scan vehicle for additional body module/BCM codes and freeze frame data
  • Visually inspect fuses and the power window relay for signs of overheating or damage
  • Inspect wiring boots at the door hinge and connectors for pin damage, corrosion, or exposed conductors
  • Operate the switch while probing for voltage at the relay coil and switch terminals (use proper test equipment)
  • Disconnect the driver door switch and/or motor and verify whether the short to battery remains
  • Check for water intrusion or contamination inside the door switch assembly

Signal parameters

  • Battery feed to relay/switch: nominal ~12 V with ignition on (should be near battery voltage)
  • Control/driver signal: typically a ground-switch or low-side drive from BCM when activating one-touch
  • Idle state: control input should not be held at battery voltage (no continuous feed) when switch is not pressed
  • Coil/resistance check: relay coil should show continuity (measure against manufacturer spec); short to battery means control side shows battery voltage when it should be open

Diagnostic algorithm

  1. Read and record all DTCs and freeze frame data from the BCM and related modules.
  2. Visually inspect fuses, relay, connectors, and door harness at the hinge boot for obvious damage or corrosion.
  3. With ignition ON, measure voltage at the relay power terminal and at the relay control terminal while operating the one-touch switch. Note whether the control terminal is held at battery voltage when it should be open.
  4. Remove or unplug the driver door switch and operate the window control from the master switch (or vice versa) to isolate whether the short is in the door switch or vehicle harness/BCM.
  5. If short persists with switch disconnected, isolate wiring sections: disconnect the door harness at the body and retest. If the short goes away, inspect door-side wiring and components; if it remains, inspect harness to BCM/relay area.
  6. Check continuity between the suspected control circuit and battery positive with the ignition off. A low resistance indicates a short; trace and repair wiring insulation faults or pin/power source cross-connections.
  7. If wiring and switch check good, bench-test or replace the power window relay and retest. If replacing relay clears the fault but it returns, continue wiring/BCM investigation.
  8. If no wiring fault found and replacement relay/switch does not fix it, test/replace the BCM or relay driver per manufacturer procedures.
  9. After repair, clear codes and verify proper one-touch operation through multiple cycles and check for reappearance of the code.

Likely causes

  • Wiring chafe at door hinge/boot causing constant feed to control circuit
  • Shorted or stuck relay in the power window relay/relay pack
  • Faulty driver window switch (one-touch contact shorted to battery)
  • Corroded connector at door switch or BCM causing unintended battery feed

Fault status

⚠️ Status
The driver power window one-touch relay/control circuit is reporting a short to battery. This can disable the one-touch function, cause continuous window operation, blow fuses, or drain the battery. Inspect related wiring, connectors, relay, switch, and BCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1401 B1410 B1320 B1330
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