B1669 - Passenger Mirror Up/Down Output Circuit Failure

DTC B1669 - Passenger Mirror Up/Down Circuit Failure

NOTE: Ford DOES NOT provide a procedure to perform the following pinpoint test without the Rotunda New Generation Star (NGS) tester 007-00500 or equivalent.

B1669-1 - Rerun Test

- Turn ignition switch to RUN.
- Turn ignition switch OFF. These two steps "wake up" the driver seat module.
- Open driver side door. This disables delay accessory function.

NOTE: Seat will move a short distance in each direction during self-test.

- Execute self-test.
- Inspect driver mirror and make sure that there are no obstructions.
- Rerun self-test diagnostics.

Is DTC B1669 still present?

YES GO to B1669-2.
NO System operating normally.

B1669-2 - Test Passenger's Mirror Vertical Outputs

- Make sure ignition remains OFF.
- Connect Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent to data link connector.
- Enter Diagnostic Data Link.
- Enter Driver Seat Module.
- Enter Active Command Modes.
- Select Power Mirror Control.
- Command Passenger Mirror Up.
- Command Passenger Mirror Down. Note motion of mirror.
- Command Passenger Mirror Up. Note motion of mirror.

Does mirror move during last two movements?

YES GO to B1669-3 to service potentiometer.
NO SERVICE Circuits 544 (P) and 957 (PIW) for open circuit or short to ground B+. TEST mirror for motor and mechanical operation. If all check out OK and mirror still does not operate, REPLACE driver seat module. RESTORE vehicle. RETEST system.

B1669-3 - Test Potentiometer Circuit 958 (GY/R) For Open

- Using a voltmeter connected to a know good ground, probe back of connector C2 of driver seat module and read voltage at potentiometer input:

Passengers Vertical: pin C2-17, circuit 957 (P/W)
Passengers Horizontal: pin C2-18, circuit 954 (DG/W)

Is voltage reading less than 0.5 volt on both circuits?

YES SERVICE circuit 958 (GY/R) for open circuit to passenger's mirror. RESTORE vehicle. RETEST system.
NO GO to B1669-4.

B1669-4 - Test Potentiometer Circuit 957 (P/W) For Open

- Using a voltmeter connected to a know good ground, probe back of connector C2 of driver seat module and read voltage at potentiometer input:

Passenger's Vertical: pin C2-17, circuit 957 (P/W)

Is voltage reading less than 0.5 volt?

YES SERVICE circuit 957 (P/W) for open circuit or damaged potentiometer. RESTORE vehicle. RETEST system.
NO GO to B1669-5.

B1669-5 - Test Potentiometer Mirror Circuit

- Using a voltmeter connected to a know good ground, probe back of connector C2 of driver seat module and read voltage at potentiometer input:

Passenger's Vertical: pin C2-17, circuit 957 (P/W)

Is voltage reading 0.5 - 4.5 volts?

YES REPLACE mirror. RESTORE vehicle. RETEST system.
NO GO to B1669-6.

B1669-6 - Test Potentiometer Circuit 955 (G/Y) For Open

- Using a voltmeter connected to a know good ground, probe back of connector C2 of driver seat module and read voltage at potentiometer inputs for motion which did not work:

Passenger's Vertical: pin C2-17, circuit 957 (P/W)
Passenger's Horizontal: pin C2-18, circuit 954 (DG/W)

Is voltage reading 4.5 - 5 volts on both circuits?

YES SERVICE Circuit 955 (GY) for open circuit to passenger mirror. RESTORE vehicle. RETEST system.
NO REPLACE driver seat module. RESTORE vehicle. RETEST system.