Test Description
The numbers below refers to the step number on the diagnostic table.
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The ground circuit to be tested is located in connector C3 of the HVAC control module.
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This step tests the blower motor supply voltage circuit of the blower motor for an open, high resistance, or short to ground. This circuit needs be tested between the blower motor relay and the blower motor also between the blower motor relay and the instrument panel fuse block.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: HVAC Schematics DEFINITION: The blower motor is inoperative in all speed positions. | |||
1 | Did you review the HVAC operation and perform the necessary inspections? | Go to Step 2 | |
2 |
Does the blower motor operate in any of the speed positions? | Go to Blower Motor Malfunction | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 7 |
4 | Connect a test lamp between the blower motor supply voltage circuit and the high blower motor control circuit of the blower motor. Does the test lamp illuminate? | Go to Step 14 | Go to Step 5 |
5 | Test the high blower motor control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 6 |
Test the ground circuit of the HVAC control module for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 15 | |
Does the blower motor operate? | Go to Step 11 | Go to Step 8 | |
8 | Probe the battery positive voltage circuit of the blower motor relay with a test lamp that is connected to a good ground. Does the test lamp illuminate? | Go to Step 9 | Go to Step 10 |
9 | Repair the blower motor supply voltage circuit of the blower motor . Refer to Wiring Repairs . Did you complete the repair? | Go to Step 20 | -- |
10 | Repair the battery positive voltage circuit of the blower motor relay. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 20 | -- |
11 | Probe the ignition 3 voltage circuit of the blower motor relay with a test lamp that is connected to a good ground. Does the test lamp illuminate? | Go to Step 12 | Go to Step 16 |
12 | Test the ground circuit of the blower motor relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 13 |
13 | Inspect for poor connections at the blower motor relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 17 |
14 | Inspect for poor connections at the blower motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 18 |
15 | Inspect for poor connections at the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 19 |
16 | Repair the ignition 3 voltage circuit of the blower motor relay. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 20 | -- |
17 | Replace the blower motor relay. Refer to Blower Motor Relay Replacement . Did you complete the replacement? | Go to Step 20 | -- |
18 | Replace the blower motor. Refer to Blower Motor Replacement . Did you complete the replacement? | Go to Step 20 | -- |
19 | Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 20 | -- |
20 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
