Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B1550: Mirror LF/RF Select Switch CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Switch B+ | 1 | 1 | -- | -- |
Driver Mirror Select Switch Signal | 2 | 2 | B1550 | -- |
Driver Mirror Select Switch Signal | 2 | 2 | B1550 | -- |
1. Power Mirror Switch Malfunction 2. Mirror Select Switch Malfunction | ||||
Circuit/System Description
The driver door module (DDM) 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 B+. The DDM senses the voltage change and allows control of the selected outside rearview mirror.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
The DDM senses an active state on both mirror select switch circuits greater than 3 seconds.
Action Taken When the DTC Sets
The DDM ignores the continuous inputs from the switch. The DDM will respond to all other valid switch inputs.
Conditions for Clearing the DTC
| • | A current DTC will clear when the fault is no longer present. |
| • | A history DTC will clear after 40 malfunction-free ignition cycles |
Reference Information
Schematic Reference
Outside Rearview Mirror Schematics
Connector End View Reference
Description and Operation
Outside Mirror Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Mirror Select Switch parameter while cycling the mirror select switch between the left and right positions. The parameter should change between Neutral, Left, and Right.
Circuit/System Testing
- Ignition OFF, disconnect the X5 harness connector at the DDM.
- Ignition ON, verify the scan tool Mirror Select Switch parameter is Neutral.
- Ignition OFF, reconnect the X5 harness connector at the DDM.
- Ignition ON, observe the scan tool Mirror Select Switch parameter while cycling the mirror select switch between the left and right positions. The parameter should change between Neutral, Left, and Right.
| ⇒ | If not the specified value, replace the DDM. |
| ⇒ | If the parameter does not cycle between the specified values, replace the outside rearview mirror switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for DDM or PDM replacement, setup, and programming |
