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. The switch is a momentary type, and is located in the center console multifunction switch. The module activates the sunshade motor based on the inputs received from the switch. When the ignition switch is in the ON position, voltage is applied to the rear window sunshade control module via the Ignition Main relay. 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 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
* Sunshade Schematics [1][2]Electrical Diagrams
* Power Moding Schematics Power Moding Schematics
* Power Distribution Schematics Power Distribution Schematics
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 rear window sunshade switch.
• If the EXTEND and RETRACT function does not work
Refer to Circuit/System Testing - Rear Window Sunshade Inoperative
• If the EXTEND and RETRACT function works
3. Command the rear window sunshade to EXTEND by pressing a 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
Rear Window Sunshade Inoperative
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48D Multifunction Switch 2-Instrument Panel. 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 2 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. Connect the harness connector at the S48D Multifunction Switch 2-Instrument Panel and disconnect the harness connector at the K50 Rear Window Sunshade Module.
4. Test for less than 10 ohms between the ground circuit terminal 5 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
5. Ignition ON.
6. Verify a test lamp illuminates between the ignition circuit terminal 4 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, verify the fuse is not open and there is voltage at the fuse.
• 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, refer to Power Mode Mismatch Power Mode Mismatch
• If the test lamp illuminates
7. Connect a test lamp between the signal circuit terminal 1 and B+.
8. Verify the test lamp turns ON and OFF when pressing the S48D Multifunction Switch 2-Instrument Panel.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2-Instrument Panel, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Ignition OFF.
4. 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 S48D Multifunction Switch 2-Instrument Panel.
• If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2-Instrument Panel.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S48D Multifunction Switch 2-Instrument Panel.
• If the test lamp turns ON and OFF
9. Ignition OFF, connect the harness connector at the K50 Rear Window Sunshade Module.
10. 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.
11. 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
12. 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
13. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2, ignition ON.
14. Verify the test lamp turns ON when commanding the EXTEND and RETRACT states with by pressing the S48D Multifunction Switch 2-Instrument Panel.
• 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
15. 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 3 and the ground circuit terminal 5.
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
1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2-Instrument Panel.
2. Test for infinite resistance between the signal terminal 4 and the ground terminal 2 with the switch in the open position.
• If less than infinite resistance
Replace the S48D Multifunction Switch 2-Instrument Panel.
• If infinite resistance
3. Test for less than 3 ohms between the signal terminal 4 and the ground terminal 2 with the switch in the closed position.
• If 3 ohms or greater
Replace the S48D Multifunction Switch 2-Instrument Panel.
• 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 diagnostic procedure.
* Rear Window Inside Sunshade Replacement Service and Repair
* Instrument Panel Multifunction Switch Replacement Instrument Panel Multifunction Switch Replacement