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. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Rear Window Sunshade Module B+ | 1 | 1 | -- | -- |
Sunshade Switch Signal | 1 | 1 | 1 | -- |
Rear Window Sunshade Actuator Control | 1 | 1 | 1 | -- |
Sunshade Switch Ground | -- | 2 | 2 | -- |
Rear Window Sunshade Module Ground | -- | 1 | 1 | -- |
1. Rear Window Sunshade Inoperative 2. Sunshade Switch Inoperative | ||||
Circuit/System Description
The rear window power sunshade control module contains the logic for extending or retracting the sunshade based on inputs received from the rear window power sunshade switch. The switch is a momentary type, and is located in the overhead console with the power sunroof controls. The module activates the sunshade motor based on the inputs received from the switch. When the Ignition switch is in the ON position, Accessory position, or when retained accessory power (RAP) is active (key off), voltage is applied to the power sunshade control module via the RAP relay. The sunshade control module controls the sunshade motor direction by changing the polarity of the applied voltage. If the ignition switch is turned to the OFF position while the sunshade is moving, the module enters a "Standby" mode, and the shade will complete its cycle. The module will remain in the "Standby" mode and the shade will remain in the position it was in when movement ceased, until the module receives another switch activation input. Movement will then resume, but in the opposite direction from the last activation.
The sunshade motor assembly contains the reversible DC drive motor and the gear train used to move the shade material to the desired position. The motor also contains a positive temperature coefficient (PTC) thermal circuit breaker to protect the system from an overload.
Reference Information
Schematic Reference
Description and Operation
Rear Window Inside Sunshade Description and Operation
Connector End View Reference
Electrical Information Reference
Circuit/System Verification
Ignition ON, command the rear window sunshade to EXTEND/RETRACT by pressing the sunshade switch. The rear window sunshade should EXTEND/RETRACT as commanded.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the sunshade switch.
- Test for less than 1.0 ohm between the ground circuit terminal A and ground.
- Ignition ON, verify that a test lamp illuminates between the signal circuit terminal C and ground.
- Ignition OFF, connect the harness connector at the sunshade switch and disconnect the C1 harness connector at the rear window sunshade module.
- Test for less than 1 ohm between the ground circuit terminal 2 and ground.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
- Ignition OFF, connect the C1 harness connector and disconnect the C2 harness connector.
- Connect a test lamp between the control terminal 1 and the control terminal 2 at the rear window sunshade module.
- Ignition ON, command the rear window sunshade to EXTEND and RETRACT by pressing the sunshade switch. The test lamp should illuminate when commanding the EXTEND and RETRACT states.
- If all circuits tests normal, test or replace the rear window sunshade actuator.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance, if the circuit tests normal, replace the rear window sunshade module. |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the rear window sunshade module. |
| ⇒ | If the test lamp does not illuminate during either of the commands, replace the rear window sunshade module. |
Component Testing
Sunshade Switch
- Ignition OFF, disconnect the harness connector at the sunshade switch.
- Test for infinite resistance between the signal terminal C and the ground terminal A with the switch in the open position.
- Test for less than 2.0 ohms between the signal terminal C and the ground terminal A with the switch in the closed position.
| ⇒ | If not the specified value, replace the sunshade switch. |
| ⇒ | If greater than the specified range, replace the sunshade switch. |
Rear Window Sunshade Actuator
- Disconnect the C2 harness connector at the rear window sunshade module.
- Install a 10 amp fused jumper wire between the rear window sunshade actuator control circuit terminal 1 and 12 volts. Momentarily install a jumper wire between the rear window sunshade actuator control circuit terminal 2 and ground. The rear window sunshade actuator should perform the EXTEND or RETRACT function
- Reverse the jumper wires; the rear window sunshade actuator should perform the RETRACT or EXTEND function.
| ⇒ | If the function does not perform as specified, replace the rear window sunshade actuator. |
| ⇒ | If the function does not perform as specified, replace the rear window sunshade actuator. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
