Engine-Codes - Gmc - B1605 GMC

B1605 GMC - Mirror Motor Horizontal Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

B1605 GMC Possible Causes

  • Faulty Driver/Passenger Rearview Mirror Motor
  • Driver/Passenger Rearview Mirror Motor harness is open or shorted
  • Driver/Passenger Rearview Mirror Motor circuit poor electrical connection
  • Faulty Driver Door Module (DDM) or Passenger Door Module (PDM)

How is the B1605 GMC code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

B1605 01 Mirror Motor Horizontal Circuit Short to Battery
B1605 02 Mirror Motor Horizontal Circuit Short to Ground
B1605 04 Mirror Motor Horizontal Circuit Open

What is the cost to diagnose the B1605 GMC code

Labor: 1.0

The cost to diagnose the B1605 GMC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B1605 GMC Meaning

The Driver Door Module (DDM) or Passenger Door Module (PDM) controls the mirror horizontal and vertical motors through the use of bi-directional motor controls. When the mirror is commanded up and down, voltage or ground is supplied to the mirror vertical motor through the mirror motor vertical control circuit and voltage or ground is supplied through the mirror motor common control circuit.
Horizontal controls operate in the same manner with the mirror motor horizontal control circuit supplying voltage or ground and the mirror motor common control circuit supplying voltage or ground to the mirror horizontal motor when the mirror is commanded right and left.

More Information

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