ajblbv

Okay guys, just starting to trouble shoot this. Rear defrost light comes on, nothing occurs....so a few questions before I tear some stuff apart to start looking around. Where does power go into the hatch to power the defrost? I see the wires on either side, what is the best way to test if there is power there? If I use a voltmeter and just put positives to the wire and ground to the frame should I get a reading if there is power?

While I firmly expect many lines to be out, that's next project...has anyone used the repair kits to repair the defrost?

Thanks for all input and experience here...

JamesC

iTrader: (5)

Circuit Operation

Voltage is applied at all times through the PWR ACC CIRCUIT BREAKER to the relay contacts and timer in the DEFOGGER CONTROL. With the IGNITION SWITCH in "Run," "Bulb Test," or "Start," a control voltage is applied through the GAGES FUSE to the TIMER AND DEFOGGER CONTROL.

Moving the DEFOGGER CONTROL to "On" turns on the solid state timer. Current flows through the PWR ACC CIRCUIT BREAKER and the timer to G322 (on body, near RH hatch support arm). This causes the relay contacts to close. Current then flows through the PWR ACC CIRCUIT BREAKER, closed relay contacts, and DEFOGGER to ground. This provides current flow to heat the DEFOGGER grid wires. Current through the closed relay contacts also flows through the "On" indiator in the DEFOGGER CONTROL to G322.

After 10 minutes of operation, the timer automatically opens the relay contacts, cutting off current flow to the DEFOGGER and "On" indicator.

If the DEFOGGER is turned on again, the timer operates the DEFOGGER for only 5 minutes. The timer will reset to 10 minutes when the IGNITION SWITCH is turned "Off" and back "On."

The DEFOGGER can be turned off manually anytime by moving the DEFOGGER CONTROL to "Off" or by turning the IGNITION SWITCH to "Off."

Troubleshooting Hints

CHECK DEFOGGER CONTROL. Remove the DEFOGGER CONTROL from behind the Instrument Panel. Leave the wire harness connected. Turn the IGNITION SWITCH to "Run" and check for these voltages:

1. ORN/Blk wire...12 volts
2. PPL/WHT wire...0 volts
3. BLK wire...0 volts
4. PNK/BLK wire...12 volts

Move DEFOGGER CONTROL button up. "On" indicator comes on. Release DEFOGGER CONTROL button. "On" indicator stays on. Check for these voltage at the DEFOGGER CONTROL.

1. ORN/BLK wire...12 volts
2. PPL/WHT wire...11 volts
3. BLK wire...0 volts
4. PNK/BLK wire...12 volts
5. BLK wire at RH side of DEFOGGER...0 volts
6. Middle of DEFOGGER...5-7 volts
7. BLK wire at LH side of DEFOGGER...10 volts

JamesC

adamlinn13

Do you mean the contacts on the back window connected to the lines on the window?