B2343

Code

Other B — Body

Seat Switch Reference Voltage Positive Common Supply Low Voltage

Brand: Other

Type: B — Body

Views: UK: 25 EN: 38 RU: 27

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Page language: EN

Causes

Blown or open fuse for seat control/reference circuit
Open, corroded or loose connector at seat switch or seat control module
Damaged wiring harness (chafing, pinched, broken conductors) between power source and switch/module
Short to ground or high resistance in the reference supply wire
Faulty seat control module or switch assembly
Poor battery or chassis ground connection affecting supply voltage

Symptoms

Seat switches do not respond or intermittently respond
Seat position or memory functions inoperative or erratic
DTC stored (B2343) and may reappear after clearing codes
Possible related seat warning message or inability to save/recall seat memory

What to check

Read DTCs and freeze-frame data with a scan tool, note ignition state when fault set
Verify vehicle battery voltage is healthy (typically ~12.4–14.5 V with ignition on/engine running)
Inspect fuses and fusible links related to seat/occupant systems
Visually inspect seat wiring harness, connectors, and areas susceptible to wear (seat rails, foam seams)
Backprobe seat switch reference pin and seat control module supply pin to measure voltage with ignition ON
Perform wiggle test on harness/connectors while monitoring voltage/DTC status

Signal parameters

Expected reference supply: typically ~5.0 V (common low-voltage reference) — acceptable range ~4.75–5.25 V (manufacturer dependent)
Fault threshold: voltage lower than ~4.3–4.5 V may set the code (varies by manufacturer)
Vehicle battery supply range: ~12.4–14.5 V with ignition/engine on
Expected continuity on intact reference feed: low ohms (near 0 Ω); insulation resistance to ground should be very high (open)

Diagnostic algorithm

Confirm condition: read and record DTC(s) and freeze-frame data. Note whether fault is current or historic. Attempt to reproduce the fault by operating seat switches.
Verify battery voltage. A weak battery or poor main ground can cause low supply voltages—repair as needed.
Inspect fuses and fuse terminals for the seat control/reference circuit. Replace blown fuses and re-test.
With ignition ON, backprobe the reference supply pin at the seat switch and at the seat control module. Measure DC voltage and compare to expected (~5 V).
If reference is low at both switch and module, check upstream power feed and ground, measure for voltage drops, and inspect connectors between fuse/power source and module. Repair open/loose connections.
If reference is normal at module but low at switch, isolate the harness: disconnect the switch connector and measure supply at the harness side to identify open/short in harness. Perform continuity and resistance checks to locate high resistance or short to ground.
Perform wiggle tests on the seat harness (while monitoring voltage/scan tool) to detect intermittent failures caused by cable movement at the rail and connector areas.
If wiring and connectors test good, suspect a faulty seat switch assembly or seat control module. Verify with known-good component or bench test per manufacturer procedures before replacement.
After repairs, clear codes and verify proper operation and that the DTC does not return.

Likely causes

Blown fuse or poor fuse connection on the reference supply
Open/high-resistance wiring or corroded connector at the seat switch or harness (often at seat rail areas)
Short to ground on the reference feed causing voltage drop
Failed seat control module or seat switch

Fault status

⚠️ Status

Seat switch reference voltage low (positive common supply). Seat switches or seat memory may not function correctly. Check fuse, wiring/connector integrity, and the seat control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.0 hours