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 (Electrical Diagrams)
* Power Moding Schematics (Power Moding Schematics)
* Power Distribution Schematics (Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
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. Headlights ON, verify that the center console multifunction switch backlight is illuminated.
• If the backlight is not illuminated, refer to Interior Backlighting Malfunction (Interior Backlighting Malfunction)
2. Ignition ON, transaxle in P (park), command the rear window sunshade to EXTEND and RETRACT by pressing the sunshade switch. The rear window sunshade should EXTEND and RETRACT each time the sunshade switch is pressed
• If the rear window sunshade does not EXTEND or RETRACT, refer to Rear Window Sunshade Malfunction.
3. Engine running, verify the rear window sunshade is extended, observe the function of the rear window sunshade while shifting the transaxle in R (reverse). The rear window sunshade should RETRACT when the transaxle is in R (reverse).
• If the rear window sunshade does not RETRACT, refer to Reverse Override Malfunction.
Circuit/System Testing
Rear Window Sunshade Malfunction
1. Ignition OFF, disconnect the harness connector at the K50 rear window sunshade module.
2. Test for less than 35 ohm between the ground circuit terminal 1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
• If the test lamp does not illuminate and the ignition circuit fuse is open, test the ignition circuit for a short to ground. If the circuit tests normal, replace the K50 rear window sunshade module.
• If the test lamp does not illuminate and the ignition circuit fuse is normal, test the ignition circuit for an open/high resistance. If the circuit tests normal, refer to Ignition Main Relay Malfunction.
4. Connect a test lamp between the signal circuit terminal 8 and B+.
5. Command the rear window sunshade motor to EXTEND and RETRACT by pressing the sunshade switch, the test lamp should turn ON as the switch is pressed and turn OFF when the switch is released.
• If the test lamp is always OFF, test the signal circuit for a short to B+ or an open/high resistance. If the circuit tests normal, test or replace the S48E multi-function switch-center console.
• If the test lamp is always ON, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the S48E multi-function switch-center console.
6. Ignition OFF, connect the harness connector at the K50 rear window sunshade module and disconnect the harness connector at the at the M44 rear window sunshade motor.
7. Test for less than 35 ohm between the control circuit terminal listed below and ground:
* Control terminal 1
* Control terminal 2
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K50 rear window sunshade module.
8. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2.
9. Ignition ON, command the M44 rear window sunshade motor to EXTEND and RETRACT by pressing the sunshade switch. The test lamp should turn ON when commanding the EXTEND and RETRACT states.
• If the test lamp is OFF during either command, test either control circuit for a short to ground. If the circuit tests normal, replace the K50 rear window sunshade module.
10. If all circuits tests normal, test or replace the M44 rear window sunshade motor.
Reverse Override Malfunction
1. Ignition OFF, disconnect the harness connector at the K50 rear window sunshade module.
2. Engine running, with the transaxle in P (park), verify that test lamp does not illuminate between the signal circuit terminal 6 and ground.
• If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, refer to Backup Lamps Malfunction (Backup Lamps Malfunction).
3. With the transaxle in R (reverse), verify that a test lamp illuminates between the signal circuit terminal 6 and ground.
• 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, refer to Backup Lamps Malfunction (Backup Lamps Malfunction).
4. If all circuits tests normal, replace the K50 rear window sunshade module.
Ignition Main Relay Malfunction
1. Ignition OFF, disconnect the KR73 Ignition Main relay.
2. Test for less than 5ohm between the ground circuit terminal 86 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Verify that a test lamp illuminates between the ignition circuit terminal 85 and the ground circuit terminal 86.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
5. If all circuits test normal, test or replace the KR73 Ignition Main relay.
Component Testing
Sunshade Switch
1. Ignition OFF, disconnect the harness connector at the S48E multi-function switch-center console.
2. Test for infinite resistance between the signal terminal 4 and the ground terminal 2 with the switch in the open position.
• If not the specified value, replace the S48E multi-function switch-center console.
3. Test for less than 2.0 ohm between the signal terminal 4 and the ground terminal 2 with the switch in the closed position.
• If greater than the specified range, replace the S48E multi-function switch-center console.
Rear Window Sunshade Motor
1. Ignition OFF, disconnect the harness connector at the M44 rear window sunshade motor.
2. Install a 10A fused jumper wire between one of the control circuit terminals and 12 V. Momentarily install a jumper wire between the other control circuit terminal and ground. Reverse the jumper wires at least two times, the M44 rear window sunshade motor should perform the EXTEND and RETRACT functions.
• If it does not perform as specified, replace the M44 rear window sunshade motor.
Relay Test
1. Ignition OFF, disconnect the KR73 Ignition Main relay.
2. Test for 60-180 ohm between terminals 85 and 86.
• If not within the specified range, replace the KR73 Ignition Main relay.
3. Test for infinite resistance between the following terminals:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
• If not the specified value, replace the KR73 Ignition Main relay.
4. Install a 2A fused jumper wire between relay terminal 85 and 12V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohm between terminals 30 and 87.
• If greater than the specified range, replace the KR73 Ignition Main relay.
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 (Service and Repair)
* Relay Replacement (Attached to Wire Harness) (Relay Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (Relay Replacement (Within an Electrical Center))
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming