OBD Guide
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B1688

Lamp Dome Input Circuit Short To Ground

B1688 is an OBD-II diagnostic trouble code meaning: Lamp Dome Input Circuit Short To Ground. Common causes: open or short circuit in wiring harness, dome light switch malfunction. Estimated repair cost: $11–56.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$11–56 (est.)

Symptoms

  • Dome light not working
  • Check Engine Light Is On
  • Error B1688 in ECU memory

Causes

  • Open or short circuit in wiring harness
  • Dome light switch malfunction
  • Short circuit to ground
  • Body Control Module (BCM) Malfunction

How to Fix

  1. Check wiring harness for damage
  2. Check dome light switch
  3. Check the circuit for short circuit to ground
  4. Check the performance of the body control module (BCM)

Related codes

B1687B1689

FAQ

What does the B1688 code mean?

B1688 is an OBD-II diagnostic trouble code that indicates: Lamp Dome Input Circuit Short To Ground

What causes a B1688 error code?

The most common causes of B1688 include: Open or short circuit in wiring harness; Dome light switch malfunction; Short circuit to ground; Body Control Module (BCM) Malfunction.

How do I fix a B1688 diagnostic trouble code?

To fix B1688: Check wiring harness for damage. Check dome light switch. Check the circuit for short circuit to ground. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1688?

Do not drive — repair immediately

How much does it cost to fix B1688?

The estimated repair cost for B1688 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat