For 1990-2009 cars

### Circuit Description

The outside mirror control switch is contained within the driver door switch assembly (DDSA). The DDSA contains a microprocessor which takes the signal generated by the outside mirror control switch and assigns a digital message to the switch signal. The DDSA sends this message via the GMLAN serial data circuit to the driver door module (DDM) to move the left mirror or the passenger front door module (PDM) to move the right mirror. The DDM or PDM then applies voltage and ground to the appropriate circuits of the appropriate mirror motor to move the mirror vertically and/or horizontally. For more detailed information concerning power outside mirror operation refer to Outside Mirror Description and Operation .

### DTC Descriptors

This diagnostic procedure supports the following DTCs:

• | DTC B1560 Mirror Right Control Switch Circuit

• | DTC B1565 Mirror Left Control Switch Circuit

• | DTC B1570 Mirror Up Control Switch Circuit

• | DTC B1575 Mirror Down Control Switch Circuit

This vehicle has DTCs which include DTC symptoms. For more information on DTC symptoms, refer to DTC Symptom Description .

DTC Symptom | DTC Symptom Descriptor
--- | ---
02 | Short to Ground

### Conditions for Running the DTC

The DDM and the DDSA must be powered.

### Conditions for Setting the DTC

The DDSA communicates with the DDM via GMLAN that the outside power mirror control switch is closed for more than 30 seconds.

### Action Taken When the DTC Sets

The DDSA deactivates and ignores inputs from the failed switch contacts and stops sending messages for this switch to the DDM. The DDSA will continue to respond to inputs from other non-failed switch contacts.

### Conditions for Clearing the DTC

• | The condition responsible for setting the DTC no longer exists.

• | You issue a scan tool CLEAR DTCs command.

• | After 40 consecutive warm-up cycles without failure, the history DTC will be cleared.

### Diagnostic Aids

Important: When a contact for a mirror position has failed, it will affect both mirrors.

Thoroughly inspect the wiring and connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis, causing the reappearance of the malfunction after the part replacement. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Outside Rearview Mirror Schematics Connector End View Reference: Vehicle Access Connector End Views
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the Mirror Direction Switch parameter in the driver door switch assembly (DDSA) data 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 the scan tool, observe the Mirror Direction Switch parameter.

Does the Mirror Direction Switch parameter change state?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 4

4 | Inspect for poor connections at the DDSA harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 6 | Go to Step 5
5 | Replace the driver door switch assembly. Refer to Door Lock and Side Window Switch Replacement - Driver Side . Did you complete the replacement? | Go to Step 6 | --
6 |

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