For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the defogger System Check performed? | -- | Go to Step 2 | Go to Defogger System Check
2 |

1. Turn the ignition switch to ON.
2. Press the rear defogger switch to the ON position.
3. Back probe the rear defogger switch using a J 35616-200 unpowered test lamp between cavity 2 of the rear defogger switch connector and ground.

Did the test lamp light?

--

Go to Step 4

Go to Step 3

3 | Replace the rear defogger switch. Refer to Rear Window Defogger Switch Replacement . Is the repair complete? | -- | Go to Defogger System Check | --
4 |

1. Turn the ignition switch to OFF.
2. Disconnect the RED/WHT connector to the rear defogger.
3. Turn the ignition switch to ON.
4. Press the rear defogger switch to ON.
5. Connect a J 35616-200 unpowered test lamp between the RED/WHT cavity of the rear defogger connector and ground.

Did the test lamp light?

--

Go to Step 5

Go to Step 6

5 |

1. Turn the ignition switch to OFF.
2. Disconnect the BLK wire connector from the rear defogger.
3. Using a J 39200 Digital Multimeter, test for continuity between the BLK wire connector of the rear defogger and ground .

Is there continuity?

--

Go to Step 7

Go to Step 8

6 | Repair the open RED/WHT wire between the rear defogger connector and cavity 2 of the rear defogger switch. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | --
7 | Repair the rear defogger. Refer to Grid Line Repair . Is the repair complete? | -- | Go to Defogger System Check | --
8 | Repair the open in the BLK wire connector of the rear defogger and ground G400. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | --