Circuit 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 12 volts. The DDM senses the voltage change and allows control of the selected outside rearview mirror.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1550 Mirror Left Front or Right Front Select Switch Circuit
Conditions for Running the DTC
| • | Battery voltage must be between 9-16 volts. |
| • | The ignition switch is in the ON position. |
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
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 |
|---|---|---|---|---|
Schematic Reference: Outside Rearview Mirror Schematics Connector End View Reference: Power Door Systems Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the scan tool display Neutral/Fold? | -- | Go to Step 3 | Go to Step 4 |
3 |
Does the Mirror Select switch data parameter change state appropriately with each selection? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 4 |
4 |
Does the scan tool display Neutral/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 | Replace the driver door module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. 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 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
