Circuit Description
The driver door module (DDM) supplies battery positive voltage to the power mirror switch. When the mirror direction switch is placed in the up or down position, the appropriate signal circuit is switched to battery voltage. The driver door module senses the voltage change and activates the selected outside rearview mirror in the appropriate direction.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1720 Mirror Up and Down Control 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 the mirror switch up and down signal circuits greater than 3 seconds.
Action Taken When the DTC Sets
The DDM will ignore 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 response to a scan tool command.
Step | Action | Value(s) | 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 | |
2 |
Does the scan tool display Idle? | -- | Go to Step 3 | Go to Step 4 |
3 |
Does the Mirror Switch Vertical data parameter change state with each selection? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 4 |
4 |
Does the scan tool display Idle? | -- | Go to Step 7 | Go to Step 5 |
5 | Inspect for poor connections at the harness connector of the driver door module (DDM). Refer to Testing for Intermittent Conditions and Poor Connections. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 6 |
6 | Replace the DDM. Refer to Control Module References 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 |
