B2344

Code

Other B — Body

Seat Switch Reference Voltage Positive Common Supply Voltage Fault

Brand: Other

Type: B — Body

Views: UK: 31 EN: 42 RU: 30

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Open or high-resistance connection in the reference voltage wire between BCM/seat module and seat switch
Short to battery positive (12V) or short to ground on the reference circuit
Corroded/loose connector or damaged pins at seat switch or module
Faulty seat switch assembly or seat control module internal regulator
Aftermarket accessories or repairs that disturbed wiring (seat heaters, alarms)
Intermittent wiring fault caused by chafing, pinched harness, or water intrusion

Seat switches or power seat adjustments partially or fully inoperative
Seat memory or lumbar functions not working
DTC stored in body/seat module; may reappear after battery disconnect cleared
Possible illumination of a related warning light or messages depending on vehicle (seat/airbag/occupant detection)
Intermittent operation of seat controls (works sometimes, then fails)

Read and record freeze frame and all related codes from the body or seat control module
Verify battery voltage is healthy (12.2–14.6 V) before diagnosis
Visually inspect seat wiring harness, connectors, and pins for damage, corrosion, or water ingress
Backprobe the seat switch connector and measure reference voltage with ignition ON
Wiggle harness and connectors while observing voltage and module inputs to reproduce intermittent faults
Inspect for aftermarket devices or previous repairs at the seat area

Expected reference voltage (VREF) at seat switch pin: typically about 5 V (commonly 4.5–5.5 V) with ignition/accessory ON
If vehicle uses a 12 V reference instead, expected ~12 V (11–14 V) with ignition ON — confirm with service literature
Continuity: low resistance path from seat switch VREF pin to supplying module pin (usually
No short to chassis ground or battery positive on the reference wire (infinite or very high resistance when open-circuited)

Retrieve all stored codes and freeze frame data; note whether related seat/airbag codes are present
Verify vehicle battery and charging system voltages are within normal range
Visually inspect seat area wiring, connectors, and switch assembly for damage, corrosion, or water intrusion
Backprobe the seat switch reference pin at the switch and at the supplying module with ignition ON; confirm expected VREF (typically ~5 V)
If VREF is low or missing at the switch, test for continuity between the switch reference pin and the module reference pin; repair any open/high-resistance circuits
If VREF is present at the module but shorted at the switch, disconnect the switch and re-measure to isolate a short in the harness or switch
If VREF is higher than expected (closer to battery voltage), check for short to +12V and inspect wiring insulation for pinches or chafing
Perform wiggle tests on harness and connectors while monitoring the voltage to find intermittent faults
Inspect and test connector pins for corrosion or poor mating and repair/replace as required
If wiring and connectors check good, test or swap the seat switch or seat control module per service procedures (avoid replacing module unless wiring confirmed good)
Clear codes and verify repair by road test or repeated operation of seat switches to confirm the fault does not return