GM Service Manual Online
For 1990-2009 cars only

Object Number: 428877  Size: MF
RH Mirrors W/A45
Simple Bus Interface
Handling ESD Sensitive Parts Notice

Circuit Description

The passenger mirror horizontal position sensor is a potentiometer. The driver door module determines the horizontal position of the mirror based on the voltage from the sensor. The sensor is powered by the passenger door module. The passenger door module converts the sensors feedback voltage to a simple bus digital signal and communicates it to the driver door module.

Conditions for Running the DTC

The driver door module and the passenger door module must be powered.

Conditions for Setting the DTC

The feedback voltage is less than 0.25 V or greater than 4.75 V for more than 3 seconds.

Action Taken When the DTC Sets

Memory movements on this axis are disabled. Manual movements are not disabled.

Conditions for Clearing the DTC

The sensor short to ground condition must be corrected.

Step

Action

Value(s)

Yes

No

1

Did you perform A Diagnostic System Check - Door Systems?

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Go to Step 2

Go to Diagnostic System Check - Door Systems

2

  1. Install a scan tool.
  2. Turn ON the ignition leaving the engine OFF.
  3. Move the mirror to the limits of travel using the mirror control switches.
  4. Observe the Rt. Horiz. Mirror Pos. parameter in the drivers door module (DDM) data list using the scan tool.

Does the scan tool indicate the voltage varies and is within the specified range?

0.25-4.75 V

Go to Step 8

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the mirror harness connector from the door module.
  3. Measure the mirror sensor 5 volt reference circuit.
  4. Turn ON the ignition leaving the engine OFF.

Does the voltage measure near the specified value?

4.75-5.50 V

Go to Step 4

Go to Step 7

4

  1. Turn OFF the ignition.
  2. Probe the RH mirror signal circuit with a fused jumper connected to the passenger mirror sensor return circuit.
  3. Turn ON the ignition leaving the engine OFF.
  4. Observe the Rt. Horiz. Mirror Pos. parameter using the scan tool.

Does the scan tool indicate the voltage is near the specified value?

0-0.25 V

Go to Step 5

Go to Step 7

5

Inspect for poor connections/terminal tension at the right front door module (RFDM) harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 8

Go to Step 6

6

Replace the RH mirror . Refer to Power Mirror Replacement

Did you complete the replacement?

--

Go to Step 8

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7

Replace the RFDM. Refer to Door Control Module Replacement .

Did you complete the replacement?

--

Go to Step 8

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8

  1. Clear the DTCs using the scan tool.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK