Rear Window Defogger Inoperative w/o UE7
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
If Load Shed Lvl. 2 R. Defog. data parameter is displayed as Enabled. System voltage may be low due to number of loads enabled on the vehicle, while the ignition is ON. This may be normal due to the number of loads enabled or the vehicle may have a charging system or battery concern.
-
Gain access to the RR DEFOG relay and listen for an audible click when the relay operates. Command both the ON and OFF states of the RR DEFOG relay. Repeat the commands as necessary.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Defogger Schematics Component End View Reference: Stationary Windows Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the rear window defogger indicator illuminate? | Go to Step 3 | Go to Step 5 |
3 | Connect a test lamp between the rear window defogger grid and a good ground. Does the test lamp illuminate? | Go to Step 4 | Go to Step 7 |
4 | Connect a test lamp between the left side of the rear window defogger grid and the right side of the rear window defogger grid. Does the test lamp illuminate? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 17 |
5 | With a scan tool, observe the Rear Defog Relay data parameter in the Rear Integration Module (RIM) data list. Does the scan tool display ON? | Go to Step 6 | Go to Step 14 |
With a scan tool, observe the Load Shed Lvl. 2 R. Defog. data parameter in the RIM data list. Does the scan tool display Enabled? | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | Go to Step 14 | |
Do you hear a click when you command the RR DEFOG relay ON and OFF? | Go to Step 10 | Go to Step 8 | |
8 |
Does the test lamp illuminate? | Go to Step 9 | Go to Step 18 |
9 |
Does the test lamp illuminate? | Go to Step 15 | Go to Step 12 |
10 |
Does the test lamp illuminate? | Go to Step 11 | Go to Step 13 |
11 |
Does the test lamp illuminate? | Go to Step 15 | Go to Step 20 |
12 | Test the control circuit of the RR DEFOG relay for an open or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 24 | Go to Step 16 |
13 | Test the battery positive voltage circuit of the RR DEFOG relay switched input for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 24 | Go to Step 19 |
14 | Inspect for a poor connection at the harness connector of the IPM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 24 | Go to Step 21 |
15 | Inspect for a poor connection at the RR DEFOG relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 24 | Go to Step 22 |
16 | Inspect for a poor connection at the harness connector of the RIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 24 | Go to Step 23 |
17 | Repair an open or high resistance in the ground circuit of the rear window defogger. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
18 | Repair an open or a high resistance in the ignition voltage circuit of the RR DEFOG relay coil. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
19 | Repair a short to ground in the supply voltage circuit of the rear window defogger. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
20 | Repair an open or high resistance in the supply voltage circuit of the rear window defogger. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
21 | Replace the IPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 24 | -- |
22 | Replace the RR DEFOG relay. Did you complete the replacement? | Go to Step 24 | -- |
23 | Replace the RIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 24 | -- |
24 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Rear Window Defogger Inoperative w/ UE7
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
If Load Shed Lvl.2 R. Defog. data parameter is displayed as Enabled. System voltage may be low due to number of loads enabled on the vehicle, while the ignition is ON. This may be normal due to the number of loads enabled or the vehicle may have a charging system or battery concern.
-
Gain access to the RR DEFOG relay and listen for an audible click when the relay operates. Command both the ON and OFF states of the RR DEFOG relay. Repeat the commands as necessary.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Defogger Schematics Component End View Reference: Stationary Windows Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the rear window defogger indicator illuminate? | Go to Step 3 | Go to Step 5 |
3 | Connect a test lamp between the rear window defogger grid and a good ground. Does the test lamp illuminate? | Go to Step 4 | Go to Step 7 |
4 | Connect a test lamp between the left side of the rear window defogger grid and the right side of the rear window defogger grid. Does the test lamp illuminate? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 12 |
5 | With a scan tool, observe the Rear Defog Relay data parameter in the Rear Integration Module (RIM) data list. Does the scan tool display ON? | Go to Step 6 | Go to Step 15 |
With a scan tool, observe the Load Shed Lvl. 2 R. Defog. data parameter in the RIM data list. Does the scan tool display Enabled? | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | Go to Step 15 | |
Do you hear a click when you command the RR DEFOG relay ON and OFF? | Go to Step 10 | Go to Step 8 | |
8 |
Does the test lamp illuminate? | Go to Step 9 | Go to Step 19 |
9 |
Does the test lamp illuminate? | Go to Step 17 | Go to Step 13 |
10 |
Does the test lamp illuminate? | Go to Step 11 | Go to Step 14 |
11 |
Does the test lamp illuminate? | Go to Step 17 | Go to Step 21 |
12 | Test the ground circuit of the TV Antenna Module for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 16 |
13 | Test the control circuit of the RR DEFOG relay for an open or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 18 |
14 | Test the battery positive voltage circuit of the RR DEFOG relay switched input for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 20 |
15 | Inspect for a poor connection at the harness connector of the IPM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 22 |
16 | Inspect for a poor connection at the harness connector of the TV Antenna Module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 23 |
17 | Inspect for a poor connection at the RR DEFOG relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 24 |
18 | Inspect for a poor connection at the harness connector of the RIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | Go to Step 25 |
19 | Repair an open or a high resistance in the ignition voltage circuit of the RR DEFOG relay coil. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
20 | Repair a short to ground in the supply voltage circuit of the rear window defogger. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
21 | Repair an open or high resistance in the supply voltage circuit of the rear window defogger. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
22 | Replace the IPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 26 | -- |
23 | Replace the TV Antenna Module. Refer to Television Antenna Module Replacement in Navigation Systems. Did you complete the replacement? | Go to Step 26 | -- |
24 | Replace the RR DEFOG relay. Did you complete the replacement? | Go to Step 26 | -- |
25 | Replace the RIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 26 | -- |
26 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
