Step | Action | Yes | No |
|---|---|---|---|
1 | Did you review the Rear Window Defogger Description and the Rear Window Defogger Circuit Description operation and perform the necessary inspections? | Go to Step 2 | |
2 | Verify that the defogger is inoperative. Is the defogger inoperative? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections |
3 | Connect a test lamp between the defogger connector 1 and ground. Does the test lamp illuminate with the ignition switch ON and the defogger switch depressed? | Go to Step 4 | Go to Step 7 |
4 | Connect a test lamp between the defogger connector 2 and B+. Does the test lamp illuminate? | Go to Step 5 | Go to Step 6 |
5 | Repair the defogger grid. Refer to Grid Line Repair and/or Bus Bar Lead Terminal Repair . Is the repair complete? | Go to Step 22 | -- |
6 | Repair the open in the BLK wire between the defogger connector 2 and G401. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 22 | -- |
7 | Test for battery voltage at terminal 2 of the defogger relay with the ignition switch ON and the defogger switch depressed. Is battery voltage present? | Go to Step 8 | Go to Step 9 |
8 | Repair the open in the BLK /RED wire between the defogger relay and the defogger grid. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 22 | -- |
9 |
Is battery voltage present? | Go to Step 11 | Go to Step 10 |
10 | Repair the open in the YEL/GRN wire between the defogger relay and S259. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 22 | -- |
11 |
Does the test lamp illuminate? | Go to Step 13 | Go to Step 12 |
12 | Repair the open in the BLK wire between the defogger relay and S248. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 22 | -- |
13 |
Is the voltage 6-8 volts? | Go to Step 14 | Go to Step 21 |
14 | Test for voltage at terminal 1 of the defogger switch with the ignition switch ON and the defogger switch depressed. Is the voltage 6-8 volts? | Go to Step 16 | Go to Step 15 |
15 | Repair the open in the RED/BLU wire between the defogger relay and the defogger switch. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 22 | -- |
16 |
Does the test lamp illuminate? | Go to Step 18 | Go to Step 17 |
17 | Repair the open in the BLK wire between the defogger switch and S248. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 22 | -- |
18 | Connect a test lamp between the defogger switch connector 3 and B+. Does the test lamp illuminate? | Go to Step 20 | Go to Step 19 |
19 | Repair the open in the BLK /RED wire between the defogger switch and S257. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 22 | -- |
20 | Replace the defogger switch. Refer to Rear Window Defogger Switch Replacement . Is the repair complete? | Go to Step 22 | -- |
21 | Replace the defogger relay. Refer to Rear Window Defogger Relay Replacement . Is the repair complete? | Go to Step 22 | -- |
22 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
