B2347

Code

Other B — Body

Mirror Switch Reference Voltage Positive Common Supply Low Voltage

Brand: Other

Type: B — Body

Views: UK: 27 EN: 44 RU: 22

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Page language: EN

Read stored and pending codes, note freeze-frame and key-on status
Visual inspection of fuses, relays and mirror wiring harnesses for damage or corrosion
Backprobe the mirror switch reference pin and measure voltage with ignition ON
Check battery voltage and vehicle charging system to rule out low system voltage
Verify solid ground at mirror and control module (measure resistance to battery negative)
Wiggle test wiring/connectors while monitoring voltage and scanner data

Mirror switch reference (positive common) expected ≈ 4.8–5.2 V with ignition/accessory ON (if 5V logic reference used)
Vehicle supply/power rail ≈ 11–14.5 V with engine off/ON respectively
Ground continuity: < 1 Ω from mirror ground to battery negative
Reference supply should remain stable under light load; large drop indicates short/high resistance
Open-circuit, short-to-ground or short-to-B+ will alter the above values

Connect a scan tool, record B2347 and any related codes; clear codes and see if B2347 returns.
Verify vehicle battery voltage and charging system. Low system voltage can cause false low-reference detections.
Locate mirror switch and wiring diagram to identify the reference supply pin. Inspect fuses/relays that supply that circuit.
With ignition ON, backprobe the mirror switch reference pin and measure voltage to ground. Compare to expected reference (~5 V) and battery voltage.
If reference voltage is low or absent, trace wiring toward the module/BCM: inspect connectors for corrosion, bent pins, or water intrusion; perform wiggle tests while monitoring voltage.
Check continuity/resistance of the reference wire between switch and supplying module; repair any high-resistance/open circuits.
Verify ground integrity at the mirror and module; clean and tighten ground connections if needed.
If wiring and grounds are good and reference still low, substitute a known-good mirror switch (if available) or bench-test the mirror switch to isolate the failure.
If switch tests good, suspect the supplying module (BCM/IPC). Verify with module output tests per manufacturer procedures and consider module programming or replacement if confirmed.
After repairs, clear codes and confirm normal operation through multiple key cycles and function checks.