The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Defogger Schematics | |||
1 | Did you review the operation of the rear window defogger system and perform the necessary inspections? | Go to Step 2 | |
2 |
Does the rear window defogger indicator illuminate? | Go to Step 3 | Go to Step 10 |
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 5 |
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 14 |
Command the RR DEFOG relay ON and OFF, by depressing the rear window defogger switch on the HVAC Control Module. Do you hear a click when you command the RR DEFOG relay ON and OFF? | Go to Step 8 | Go to Step 6 | |
6 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 15 |
7 |
Does the test lamp illuminate? | Go to Step 12 | Go to Step 10 |
8 |
Does the test lamp illuminate? | Go to Step 9 | Go to Step 11 |
9 |
Does the test lamp illuminate? | Go to Step 12 | Go to Step 17 |
10 | Test the control circuit of the RR DEFOG relay for an open or short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 13 |
11 | Test the battery positive circuit of the RR DEFOG relay switch 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 20 | Go to Step 16 |
12 | 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 20 | Go to Step 18 |
13 | Inspect for a poor connection at the harness connector of the HVAC Control 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 20 | Go to Step 19 |
14 | Repair an open or high resistance in the ground circuit of the rear window defogger grid. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 20 | -- |
15 | Repair an open or high resistance in the ignition 1 voltage circuit of the RR DEFOG relay coil. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 20 | -- |
16 | Repair the 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 20 | -- |
17 | 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 20 | -- |
18 | Replace the RR DEFOG relay. Did you complete the replacement? | Go to Step 20 | -- |
19 | Replace the HVAC Control Module. Refer to Heater and Air Conditioning Control Replacement in HVAC Systems - Manual or HVAC Control Module Replacement in HVAC Systems - Automatic. Did you complete the replacement? | Go to Step 20 | -- |
20 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
The number(s) below refer to the step number(s) on the diagnostic table.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Defogger Schematics | |||
1 | Did you review the operation of the rear window defogger system and perform the necessary inspections? | Go to Step 2 | |
2 |
Does the rear window defogger indicator illuminate? | Go to Step 3 | Go to Step 11 |
3 |
Does the test lamp illuminate on both rear window defogger grids? | Go to Step 4 | Go to Step 5 |
4 |
Does the test lamp illuminate on both rear window defogger grids? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 15 |
5 | Does the test lamp illuminate on one of the rear window defogger grids? | Go to Step 16 | Go to Step 6 |
Command the RR DEFOG relay ON and OFF, by depressing the rear window defogger switch on the HVAC Control Module. Do you hear a click when you command the RR DEFOG relay ON and OFF? | Go to Step 9 | Go to Step 7 | |
7 |
Does the test lamp illuminate? | Go to Step 8 | Go to Step 17 |
8 |
Does the test lamp illuminate? | Go to Step 13 | Go to Step 11 |
9 |
Does the test lamp illuminate? | Go to Step 10 | Go to Step 12 |
10 |
Does the test lamp illuminate? | Go to Step 13 | Go to Step 16 |
11 | Test the control circuit of the RR DEFOG relay for an open or short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 14 |
12 | Test the battery positive voltage circuit of the RR DEFOG relay coil 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 21 | Go to Step 18 |
13 | 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 21 | Go to Step 19 |
14 | Inspect for a poor connection at the harness connector of the HVAC Control 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 21 | Go to Step 20 |
15 | Repair an open or high resistance in the ground circuit of the rear window defogger grid. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 21 | -- |
16 | 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 21 | -- |
17 | Repair an open or high resistance in the ignition 1 voltage circuit of the RR DEFOG relay coil. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 21 | -- |
18 | Repair the 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 21 | -- |
19 | Replace the RR DEFOG relay. Did you complete the replacement? | Go to Step 21 | -- |
20 | Replace the HVAC Control Module. Refer to Heater and Air Conditioning Control Replacement in HVAC Systems - Manual or HVAC Control Module Replacement in HVAC Systems - Automatic. Did you complete the replacement? | Go to Step 21 | -- |
21 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |