What Does B1636 Mean?
This diagnostic trouble code indicates the Body Control Module (BCM) has detected an open circuit in the power mirror motor circuit for the right-side (passenger-side) mirror driver motor. An open circuit means there is a break in electrical continuity, preventing current flow to operate the mirror adjustment mechanism. The BCM monitors voltage and resistance in the mirror control circuit and sets this code when it cannot complete the circuit path to the mirror motor.
Common Causes
40%
Broken or damaged wiring harness between door jamb and mirror assembly due to repeated flexing and door opening/closing
30%
Failed mirror motor assembly with internal open circuit or degraded brush contacts
20%
Corroded or loose electrical connector at mirror assembly or door module
10%
Failed BCM or door control module with internal circuit fault
Diagnostic Steps
1
Step 1: Perform visual inspection of the right mirror assembly and wiring harness in the door jamb area for obvious breaks, cuts, or damaged insulation. Check connector at mirror base for corrosion, moisture intrusion, or backed-out terminals.
2
Step 2: Using a digital multimeter, backprobe the mirror motor connector with ignition on and verify presence of battery voltage (12-14V) on the power supply wire when mirror adjustment switch is activated in each direction.
3
Step 3: Disconnect the mirror motor connector and measure resistance across the motor terminals. A properly functioning mirror motor should show 5-50 ohms resistance; infinite resistance (OL) confirms internal motor open circuit.
4
Step 4: If voltage is present and motor tests good, inspect wiring harness continuity from BCM/door module connector to mirror connector using ohmmeter with connectors disconnected. Check for less than 1 ohm resistance on each circuit wire.
5
Step 5: Wiggle test the door jamb harness while monitoring circuit continuity to identify intermittent breaks from flexing damage. Pay special attention to the boot area where wires pass between door and body.
6
Step 6: After repair (wiring repair, connector cleaning, or mirror motor replacement), clear codes, cycle mirror through full range of motion in all directions, and verify code does not return.
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
This diagnostic trouble code indicates the Body Control Module (BCM) has detected an open circuit in the power mirror motor circuit for the right-side (passenger-side) mirror driver motor. An open circuit means there is a break in electrical continuity, preventing current flow to operate the mirror ...
The most common cause of B1636 (Mirror Driver Right Circuit Open) is: Broken or damaged wiring harness between door jamb and mirror assembly due to repeated flexing and door opening/closing
Typical repair costs for B1636 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive as this only affects power mirror adjustment functionality. Mirror can typically still be adjusted manually, though visibility may be compromised if mirror is stuck in incorrect position. Repair at convenience unless mirror position affects safe lane changes.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1636 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System - Power Mirror Control
Difficulty
Type
Manufacturer
Recommended Tools
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