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DTC codes / B06xx · Airbags, seats, doors, lights and comfort systems / B0600

B0600Mirror Adjustment Driver Side Circuit

B0600 indicates that the body control module (BCM) has detected a fault in the electrical circuit for the driver's side mirror adjustment function. The BCM monitors the motor control wiring and expects a certain current draw or voltage feedback when the mirror switch is activated; when the signal is out of range, it stores this code and may disable the mirror adjustment feature.

SystemBody
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

  • Driver's side mirror does not move in one or more directions when using the adjustment switch
  • Mirror moves erratically or only in one direction
  • Mirror adjustment switch feels unresponsive or requires multiple presses
  • Often no symptoms besides the warning light, especially if the mirror still works intermittently
  • Memory mirror function (if equipped) fails to return to saved position
  • Mirror may make a clicking or grinding noise when adjusted

Common causes, most likely first

  1. Faulty mirror adjustment switch (internal contacts worn or contaminated)
  2. Damaged wiring or connector at the mirror or door jamb (common due to flexing)
  3. Failed mirror adjustment motor (one or more motors inside the mirror assembly)
  4. Blown fuse or poor ground connection for the mirror circuit
  5. Corrosion or water intrusion in the mirror housing or connector
  6. Body control module (BCM) internal fault (rare but possible)

How to diagnose and fix it

  1. Check the fuse that supplies power to the driver's side mirror circuit and replace if blown
  2. Inspect the wiring harness and connector at the door jamb and mirror for damage, corrosion, or loose pins; repair as needed
  3. Test the mirror adjustment switch for continuity in each position using a multimeter; replace if faulty
  4. Measure voltage and ground at the mirror connector while operating the switch to confirm power and ground are reaching the motor
  5. If power and ground are present, test the mirror motor directly by applying 12 volts; replace the mirror assembly if the motor does not run
  6. Check for continuity between the BCM and mirror connector to rule out an open circuit; repair wiring if necessary
  7. If all external circuits and components test good, suspect the BCM and perform further diagnostics or replacement as a last resort

Common Misdiagnosis Traps for B0600

  • A worn mirror switch is the most frequent cause, but technicians often replace the entire mirror assembly first because the switch is harder to access on some vehicles.
  • The code can be set by a momentary loss of communication between the BCM and the mirror due to a loose connector, even if the mirror still works perfectly when tested.
  • Water intrusion into the mirror housing often corrodes the motor terminals and causes intermittent operation that sets the code only under certain conditions.
  • On vehicles with memory seats, the mirror position sensor (potentiometer) can fail and set B0600 even though the motor and switch are fine.
  • A weak battery or low charging system voltage can cause the BCM to misread mirror motor current and set a false B0600 code.

Can I keep driving with B0600?

The vehicle remains safe to drive because the driver's side mirror can still be adjusted manually, but you should avoid relying on the power adjustment until the fault is repaired. If the mirror is stuck in an unsafe position, adjust it manually before driving.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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