Step
| Action
| Value(s)
| Yes
| No
|
1
|
- Turn the ignition to RUN.
- Disconnect the rear defogger relay.
- Connect a test lamp between terminal 86 and terminal 85
of the relay. Refer to
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp light?
| --
| Go to
Step 5
| Go to
Step 2
|
2
| Connect the test lamp between relay terminal 87 and ground. Refer
to
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp light?
| --
| Go to
Step 8
| Go to
Step 3
|
3
|
- Inspect the relay terminals for proper contacts.
- Repair the contacts, as necessary. Refer to
Intermittents and Poor Connections Diagnosis
in Wiring Systems.
Did you find and correct the condition?
| --
| System OK
| Go to
Step 4
|
4
| Replace the rear defogger relay.
Did you find and correct the condition?
| --
| System OK
| --
|
5
|
- Disconnect the connector of the heater and A/C programmer.
- Connect a test lamp between terminal 86 and terminal 85
of the relay. Refer to
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp light?
| --
| Go to
Step 9
| Go to
Step 6
|
6
|
- Inspect the connector of the heater and A/C controller for proper
contact.
- Repair the contacts, as necessary. Refer to
Intermittents and Poor Connections Diagnosis
in Wiring Systems.
Did you find and correct the condition?
| --
| System OK
| Go to
Step 7
|
7
| Replace the heater and A/C programmer.
Refer to
Programmer Replacement
in HVAC.
Did you find and correct the condition?
| --
| System OK
| --
|
8
|
- Inspect CKT 293 (PPL) for a short to voltage.
- Repair the short, as necessary. Refer to
Wiring Repairs
in Wiring Systems.
Did you find and correct the condition?
| --
| System OK
| --
|
9
|
- Inspect CKT 193 (WHT) for a short to ground.
- Repair the short, as necessary. Refer to
Wiring Repairs
in Wiring Systems.
Did you find and correct the condition?
| --
| System OK
| --
|
