B2210

Code

Other B — Body

Interior Lamp Override Switch Short to Ground

Brand: Other

Type: B — Body

Views: UK: 28 EN: 38 RU: 21

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Page language: EN

Causes

Internal short in the interior lamp override switch
Chafed or pinched wiring contacting chassis ground
Corroded or damaged connector terminals
Aftermarket accessory or improper splice tied to ground
Body Control Module (BCM) input circuit fault
Water intrusion in switch or harness

Symptoms

Interior/dome lamps behave incorrectly (may be stuck on or not respond)
Battery drain or parasitic battery discharge
Lamp-related warning or message on cluster
Switch operation has no effect or is intermittent
Related fuse may blow or show signs of overheating

What to check

Read freeze frame and full DTC list; confirm B2210 is current or history
Visually inspect switch, connector, and harness for damage, corrosion, or water
Check related fuses for condition and signs of shorting
Disconnect the override switch connector and check for continuity to ground from the BCM input pin
Backprobe switch connector and measure voltage/logic level with switch operated and released
Wiggle harness and operate switch while watching ECU input and lamp behavior

Signal parameters

Switch input voltage (with key on): expected ~battery voltage or pull-up level when switch open; ~0 V (ground) when switch closed — verify against vehicle wiring diagram
Continuity to ground on the switch input:
Resistance of switch between terminals (with connector removed): open/infinite when open, low ohms when closed (manufacturer spec)
Parasitic draw: significant current from battery with ignition off can indicate shorted lamp circuit

Diagnostic algorithm

Record DTC and freeze frame; note whether code is current or historic.
Visually inspect switch, bezel, and harness routing for damage, corrosion, or water entry. Repair obvious issues.
With ignition off, disconnect the interior lamp override switch connector. Measure continuity between the BCM/sensor input terminal and ground. If continuity is present, the short is downstream (wiring/BCM).
If no continuity with connector disconnected, bench-test the switch: measure resistance between switch terminals in both positions to confirm correct operation.
With ignition on, backprobe the switch input at the connector. Observe voltage with switch operated and released; compare to expected values from wiring diagram. If input is stuck near 0 V regardless of switch, trace harness toward BCM for shorts.
Isolate the circuit by disconnecting intermediate connectors and sections of harness to locate the short (use continuity tests and visual inspection at harness pass-throughs, door hinges, and body clips).
If harness repair required, repair/replace damaged wiring, heat-shrink and seal splices, and replace corroded connectors. If switch fails bench test, replace the switch.
If wiring and switch check good, test and, if necessary, replace or reprogram the BCM per manufacturer procedures.
Clear DTCs, perform functional test of lamp override operation and monitor for reappearance of B2210. Re-check battery draw if parasitic drain was suspected.
Safety note: isolate battery when performing wiring repairs and avoid shorting power circuits.

Likely causes

Damaged wiring harness where it passes through door hinge or body panel (pinch/chafe)
Failed override switch with internal short
Corroded connector at switch or BCM causing ground continuity
Incorrect or exposed splice from aftermarket device

Fault status

⚠️ Status

B2210 — Interior Lamp Override Switch Short to Ground. The input circuit for the interior lamp override switch is detecting an unintended connection to ground. Check switch, wiring, connectors and BCM input.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours