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Sun Visor: Testing and Inspection




Rear Window Inside Sunshade Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information






Circuit/System Description

The rear window sunshade control module contains the logic for extending or retracting the sunshade based on inputs received from the sunshade switch. Both control switches are a momentary type, one is located in the overhead console, the other is located in the Rear Audio Control Module. The module activates the sunshade motor based on the inputs received from either switch. When the ignition switch is in the ON position, voltage is applied to the rear window sunshade control module. The rear window sunshade control module controls the rear window 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 rear window sunshade control module also monitors the voltage level in the backup lamp control circuit, if the module detects voltage in the backup lamp circuit while the sunshade is extended, it will command the sunshade motor to retract the sunshade to provide the operator with an unobstructed view through the rear window and will automatically extend when the voltage in the backup lamps drops to 0 volts.

The sunshade motor assembly contains the reversible direct current drive motor and the gear train used to move the shade material to the desired position. The motor also contains a positive temperature coefficient thermal circuit breaker to protect the system from an overload.

Reference Information

Schematic Reference

Sunshade Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Rear Window Inside Sunshade Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Circuit/System Verification

1. Ignition ON.

2. Verify the rear window sunshade while commanding the EXTEND and RETRACT function by pressing the S60 Rear Window Sunshade Switch on the overhead console and pressing the rear window sunshade Switch on the A13 Rear Audio Control Module.

• If the EXTEND and RETRACT function does not work from the Rear Window Sunshade Switch on the overhead console only
Refer to Circuit/System Testing - Overhead Console Rear Sunshade Switch Inoperative

• If the EXTEND and RETRACT function does not work from the Rear Window Sunshade Switch on the rear audio control only
Refer to Circuit/System Testing - Rear Audio Control Rear Sunshade Switch Inoperative

• If the EXTEND and RETRACT function does not work from both switches
Refer to Circuit/System Testing - Rear Window Sunshade Inoperative

• If the EXTEND and RETRACT function works from both switches

3. Command the rear window sunshade to EXTEND by pressing a S60 Rear Window Sunshade Switch.

4. Engine running, verify the rear window sunshade RETRACT function by shifting the transmission shift lever from P (park) to the R (reverse) position.

• If the rear window sunshade does not RETRACT with the transmission shift lever in the R (reverse) position
Refer to Circuit/System Testing - Reverse Override Malfunction

• If the rear window sunshade does RETRACT with the transmission shift lever in the R (reverse) position

5. All OK.

Circuit/System Testing

Overhead Console Rear Sunshade Switch Inoperative

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S60 Rear Window Sunshade Switch. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 ohms between the ground circuit terminal 1 and ground.

• If 10 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 10 ohms

3. Ignition ON.

4. Test for greater than 10 V between the signal circuit terminal 3 and ground.

• If 10 V or less

1. Ignition OFF, disconnect the harness connector at the K50 Rear Window Sunshade Module.

2. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K50 Rear Window Sunshade Module.

• If greater than 10 V

5. Test or replace the S60 Rear Window Sunshade Switch.

Rear Audio Control Rear Sunshade Switch Inoperative

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A13 Rear Audio Control Module. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 ohms between the ground circuit terminal 8 and ground.

• If 10 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 10 ohms

3. Ignition ON.

4. Test for greater than 10 V between the signal circuit terminal 3 and ground.

• If 10 V or less

1. Ignition OFF, disconnect the harness connector at the K50 Rear Window Sunshade Module.

2. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K50 Rear Window Sunshade Module.

• If greater than 10 V

5. Test or replace the A13 Rear Audio Control Module.

Rear Window Sunshade Inoperative

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K50 Rear Window Sunshade Module. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 ohms between the ground circuit terminal 4 and ground.

• If 10 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 10 ohms

3. Ignition ON.

4. Verify a test lamp illuminates between the ignition circuit terminal 8 and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.

2. Test for less than 2 ohms in the ignition circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, refer to Retained Accessory Power Malfunction Retained Accessory Power Malfunction.

• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.

2. Test for infinite resistance between the ignition circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K50 Rear Window Sunshade Module

• If the test lamp illuminates

5. Verify that a test lamp does not illuminate between the signal circuit terminal 5 and ground.

• If the test lamp illuminates

1. Ignition OFF, disconnect the harness connector at the S60 Rear Window Sunshade Switch.

2. Disconnect the harness connector at the A13 Rear Audio Control Module, ignition ON.

3. Test for less than 1 V between the signal circuit terminal 5 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

1. Connect the harness connector at the S60 Rear Window Sunshade Switch.

2. Test for less than 1 V between the signal circuit terminal 5 and ground.

• If 1 V or greater, test or replace the S60 Rear Window Sunshade Switch.

• If less than 1 V

1. Connect the harness connector at the A13 Rear Audio Control Module.

2. Test for less than 1 V between the signal circuit terminal 5 and ground.

• If 1 V or greater, test or replace the A13 Rear Audio Control Module.

6. Test for infinite resistance between the signal circuit terminal 5 and ground.

• If less than infinite resistance

1. Ignition OFF, disconnect the harness connector at the S60 Rear Window Sunshade Switch.

2. Disconnect the harness connector at the A13 Rear Audio Control Module, ignition ON.

3. Test for infinite resistance between the signal circuit terminal 5 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

1. Connect the harness connector at the S60 Rear Window Sunshade Switch.

2. Test for infinite resistance between the signal circuit terminal 5 and ground.

• If less than infinite resistance, test or replace the S60 Rear Window Sunshade Switch.

• If infinite resistance

1. Connect the harness connector at the A13 Rear Audio Control Module.

2. Test for infinite resistance between the signal circuit terminal 5 and ground.

• If less than infinite resistance, test or replace the A13 Rear Audio Control Module.

7. Ignition OFF, connect the harness connector at the K50 Rear Window Sunshade Module.

8. Disconnect the harness connector at the M44 Rear Window Sunshade Motor. It may take up to 2 minutes for all vehicle systems to power down.

9. Test for less than 35 ohms between the control circuit terminal 1 and ground.

• If 35 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K50 Rear Window Sunshade Module.

2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K50 Rear Window Sunshade Module.

• If less than 35 ohms

10. Test for less than 35 ohms between the control circuit terminal 2 and ground.

• If 35 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K50 Rear Window Sunshade Module.

2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K50 Rear Window Sunshade Module.

• If less than 35 ohms

11. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2, ignition ON.

12. Verify the test lamp turns ON when commanding the EXTEND and RETRACT states with by pressing the S60 Rear Window Sunshade Switch.

• If the test lamp remains OFF during either of the commands

1. Ignition OFF, disconnect the harness connector at the K50 Rear Window Sunshade Module.

2. Test for infinite resistance between each control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K50 Rear Window Sunshade Module.

• If the test lamp turns ON during each of the commands

13. Test or replace the M44 Rear Window Sunshade Motor.

Reverse Override Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K50 Rear Window Sunshade Module.

2. Engine running, connect a test lamp between the signal circuit terminal 7 and the ground circuit terminal 4.

3. Verify the test lamp turns ON when shifting the transmission selector to R (reverse).

• If the test lamp is OFF

1. Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the control circuit terminal 3 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, refer to Backup Lamps Malfunction Backup Lamps Malfunction.

• If the test lamp turns ON

4. Verify the test lamp turns OFF when shifting the transmission selector to P (park).

• If the test lamp is ON

1. Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, Engine Running.

2. Test for less than 1 V between the control circuit terminal 3 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, refer to Backup Lamps Malfunction Backup Lamps Malfunction.

• If the test lamp turns OFF

5. Test or replace the K50 Rear Window Sunshade Module.

Component Testing

Rear Window Sunshade Switch On Overhead Console

1. Ignition OFF, disconnect the harness connector at the S60 Rear Window Sunshade Switch.

2. Test for infinite resistance between the signal terminal 3 and the ground terminal 1 with the switch in the open position.

• If less than infinite resistance
Replace the S60 Rear Window Sunshade Switch.

• If infinite resistance

3. Test for less than 3 ohms between the signal terminal 3 and the ground terminal 1 with the switch in the closed position.

• If 3 ohms or greater
Replace the S60 Rear Window Sunshade Switch.

• If less than 3 ohms

4. All OK

Rear Window Sunshade Motor

1. Ignition OFF, disconnect the harness connector at the M44 Rear Window Sunshade Motor.

2. Install a 10 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M44 Rear Window Sunshade Motor should EXTEND and RETRACT functions.

• If the function does not perform the EXTEND and RETRACT functions
Replace the M44 Rear Window Sunshade Motor.

• If the function performs the EXTEND and RETRACT functions

3. All OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Roof Console Accessory Switch Trim Plate Replacement Roof Console Accessory Switch Trim Plate Replacement

* Rear Window Inside Sunshade Replacement Rear Window Inside Sunshade Replacement

* Control Module References Control Module References Rear Audio Control Module replacement, programming and setup

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