Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Defogger Schematics Connector End View Reference: Stationary Windows Connector End Views | |||
1 | Did you review the Rear Window Defogger system operation and perform the necessary inspections? | Go to Step 2 | |
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 15 |
5 |
Does the test lamp illuminate? | Go to Step 6 | Go to Step 16 |
6 | Connect a test lamp between the ignition voltage circuit of the HVAC Control Assembly and the ground circuit of the HVAC Control Assembly. Does the test lamp illuminate? | Go to Step 12 | Go to Step 17 |
Command the RR DEFOG relay ON and OFF, by depressing the rear defogger switch on the HVAC Control Assembly. 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 14 | Go to Step 12 |
10 |
Does the test lamp illuminate? | Go to Step 11 | Go to Step 19 |
11 |
Does the test lamp illuminate? | Go to Step 14 | 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 23 | Go to Step 13 |
13 | Inspect for a poor connection at the harness connector of the HVAC Control Assembly. 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 23 | Go to Step 21 |
14 | 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 23 | Go to Step 22 |
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 23 | -- |
16 | Repair an open or short to ground in the ignition voltage circuit of the HVAC Control Assembly. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 23 | -- |
17 | Repair an open or high resistance in the ground circuit of the HVAC Control Assembly. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 23 | -- |
18 | Repair an open or 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 23 | -- |
19 | Repair an open or high resistance in the battery positive voltage circuit of the RR DEFOG relay switched input. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 23 | -- |
20 | Repair an open or short to ground in the supply voltage circuit of the rear window defogger grid. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 23 | -- |
21 | Replace the HVAC Control Assembly. Refer to Heater and Air Conditioning Control Replacement in HVAC Systems - Manual. Did you complete the replacement? | Go to Step 23 | -- |
22 | Replace the RR DEFOG relay. Did you complete the replacement? | Go to Step 23 | -- |
23 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
