Step
| Action
| Value(s)
| Yes
| No
|
1
| Did you review the HVAC operation and perform the necessary inspections?
| --
| Go to
Step 2
| Go to
Symptoms
|
2
|
- Disconnect the blower motor resistor.
- Turn the ignition switch to the ON position.
- Place the heater-A/C control in the VENT position.
- Place the blower switch in the OFF position.
- Use a test lamp in order to backprobe between the blower motor
resistor harness connector terminal listed below and ground:
| • | LO - Terminal B (circuit 60) |
| • | M1 - Terminal A (circuit 63) |
| • | M2 - Terminal D (circuit 72) |
| • | M3 - Terminal C (circuit 73) |
| • | HI - Terminal F (circuit 52) |
Does the test light turn on when checking each terminal?
| --
| Go to
Step 3
| Go to
Step 6
|
3
|
- Leave the test light connected to same terminal that turned test
light on.
- Disconnect the heater-A/C control connector C1.
Does the test lamp light?
| --
| Go to
Step 4
| Go to
Step 5
|
4
| Repair the short to B+ in the following circuit: Refer to
Testing for a Short to Voltage
and
Wiring Repairs
in Wiring Systems.
| • | LO - Blower motor resistor harness connector terminal B
(circuit 60) |
| • | M1 - Blower motor resistor harness connector terminal A
(circuit 63) |
| • | M2 - Blower motor resistor harness connector terminal D
(circuit 72) |
| • | M3 - Blower motor resistor harness connector terminal C
(circuit 73) |
| • | HI - Blower motor resistor harness connector terminal F
(circuit 52) |
Is the repair complete?
| --
| Go to
Step 7
| --
|
5
| Replace the heater-A/C control. Refer to
Control Assembly Replacement
.
Is the repair complete?
| --
| Go to
Step 7
| --
|
6
| Replace the blower motor resistor. Refer to
Blower Motor Resistor Replacement
in Heating, Ventilation, and
Air Conditioning .
Is the repair complete?
| --
| Go to
Step 7
| --
|
7
| Verify that the system operates properly.
Does the system operate properly?
| --
| System OK
| Go to
Symptoms
|
