GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 Envoy - 2WD 🢒 DTC 🢒 DTC B1550

Circuit Description

The driver door module supplies battery positive voltage to the power mirror switch. When the mirror select switch is placed in the left or right mirror position, the appropriate signal circuit is switched to 12 volts. The driver door module senses the voltage change and allows control of the selected outside rearview mirror.

Conditions for Running the DTC
    • Battery voltage must be between 9.0-16.0 volts.
    • The ignition switch is in the ON position.

Conditions for Setting the DTC

The driver door module senses an active state on both mirror select switch circuits greater than 3 seconds.

Action Taken When the DTC Sets

The driver door module ignores the continuous inputs from the switch. The driver door module will respond to all other valid switch inputs.

Conditions for Clearing the DTC

When the fault is no longer present, the door module changes the current DTC to a history DTC. The door module will clear the history DTC after 50 fault free ignition cycles, or in a response to a scan tool command.

Step

Action

Value(s)

Yes

No

1

Did you perform the Door Systems Diagnostic System Check?

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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, with the engine OFF.
  3. Place the mirror select switch in the Netural/Fold position.
  4. With a scan tool, observe the Mirror Select switch data parameter.

Does the scan tool display Netural/Fold?

--

Go to Step 3

Go to Step 4

3
  1. With the scan tool, observe the Mirror Select switch parameter.
  2. Operate the mirror select switch to all positions.

Does the Mirror Select switch data parameter change state appropriatly with each selection?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 4

4
  1. Disconnect the mirror switch.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Mirror Select switch data parameter.

Does the scan tool display Netural/Fold?

--

Go to Step 7

Go to Step 5

5

Inspect for poor connections at the harness connector of the driver door module. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 8

Go to Step 6

6

Important: Perform the set up procedure for the driver door module. Refer to Door Control Module Programming/RPO Configuration .

Replace the driver door module. Refer to Door Lock and Side Window Switch Replacement - Driver Side .

Did you complete the replacement?

--

Go to Step 8

--

7

Replace the mirror switch. Refer to Power Mirror Switch Replacement .

Did you complete the replacement?

--

Go to Step 8

--

8
  1. Use the scan tool in order to clear the DTCs.
  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