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 B1720: Mirror Up and Down Control Switch CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Switch B+ | 1 | 1 | -- | -- |
Mirror Down Switch Signal | 1 | 1 | B1720 | -- |
Mirror Up Switch Signal | 1 | 1 | B1720 | -- |
1. Power Mirror Switch Malfunction 1. Mirror Vertical Switch Malfunction | ||||
Circuit/System 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.
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 the mirror vertical switch signal 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
Command the left and right outside mirror to move up, down, left and right using the mirror directional switch. The mirror should move in the commanded direction.
Circuit/System Testing
- Ignition OFF, disconnect the X5 harness connector at the DDM.
- Ignition ON, verify the scan tool Mirror Motor parameter is Idle.
- Ignition OFF, connect the X5 harness connector at the DDM.
- Ignition ON, observe the scan tool Mirror Motor parameter while cycling the mirror directional switch between the up, down, left and right positions. The parameter should change between Idle, Up, Down, 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 |
