GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 LeSabre 🢒 Body 🢒 Doors 🢒 DTC B1562, B1567, B1572, or B1577

Circuit Description

The switch that failed and generated this diagnostic trouble code (DTC) is part of the driver door switch assembly (DDSA). This assembly contains a microprocessor which takes the signal generated by this switch and assigns a digital message to the switch signal. The DDSA then sends this message over the power door serial data link to the driver door module (DDM). The DDM then either moves the left mirror or sends commands over the power door serial data link to the right front door module to move the right mirror.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

    • DTC B1562 Mirror Right Control Switch Circuit Low
    • DTC B1567 Mirror Left Control Switch Circuit Low
    • DTC B1572 Mirror Up Control Switch Circuit Low
    • DTC B1577 Mirror Down Control Switch Circuit Low

Conditions for Running the DTC

The DDM must be powered for this DTC to set.

Conditions for Setting the DTC

If the DDM receives the message that a mirror switch is closed for more than 30 continuous seconds, the DDM sets a DTC.

Action Taken When the DTC Sets

The DDM ignores the continuous message from the DDSA for this switch. The DDM will not respond to the invalid mirror switch message as a command for either door mirror. The DDM will respond to all other valid switch messages.

Conditions for Clearing the DTC

When the switch message status changes, the DDM clears this current DTC and stores it as history. The history DTC will clear either after 50 OFF/ON ignition switch cycles without a repeated failure or in response to a scan tool command.

Step

Action

Yes

No

Schematic Reference: Outside Rearview Mirror Schematics and Door Control Module Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Install a scan tool.
  2. Turn ON the ignition leaving the engine OFF.
  3. With a scan tool, observe the Driver Mirror Switches parameter in the Driver Door Module (DDM) Inputs list.

Does the scan tool display Idle?

Go to Step 3

Go to Step 4

3
  1. Activate the mirror switch in all directions.
  2. With a scan tool, observe the Driver Mirror Switches parameter.

Does the Driver Mirror Switches parameter change state?

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

Go to Step 4

4
  1. Turn OFF the ignition.
  2. Disconnect the driver door switch assembly (DDSA).
  3. Turn ON the ignition leaving the engine OFF.
  4. With a scan tool, observe the Driver Mirror Switches parameter using the scan tool.

Does the scan tool indicate the Idle state?

Go to Step 6

Go to Step 5

5

Inspect for poor connections at the DDM 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 9

Go to Step 7

6

Inspect for poor connections at the DDSA 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 9

Go to Step 8

7

Replace the DDM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 9

--

8

Replace the DDSA. Refer to Front Door Switch Replacement .

Did you complete the replacement?

Go to Step 9

--

9
  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