Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
|
Important: Zero the DMM before taking measurements. This will avoid misdiagnosis. | ||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | Go To Diagnostic System Check |
2 | Inspect the radio battery fuse for an open. Is the radio battery fuse open? | -- | Go to Step 3 | Go to Step 4 |
3 | Locate and repair a short to ground in circuit 640 (ORN). Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 29 | -- |
4 | Inspect the DIC/HVAC fuse for an open. Is the DIC/HVAC fuse open? | -- | Go to Step 5 | Go to Step 6 |
5 | Locate and repair a short to ground in circuit 541 (BRN). Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 29 | -- | |
6 | Inspect the HVAC HI fuse for an open. Is the HVAC HI fuse open? | - | Go to Step 7 | Go to Step 8 |
7 | Locate and repair a short to the ground in circuit 40 (ORN). Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Is the repair complete? | - | Go to Step 29 | -- |
8 | Inspect the ground G200. Is the ground clean and tight? | - | Go to Step 10 | Go to Step 9 |
9 | Clean and tighten ground G200. Is the repair complete? | - | Go to Step 29 | -- |
10 |
Does the test light illuminate? | - | Go to Step 11 | Go to Step 12 |
11 | Replace the blower motor. Refer to Blower Motor and Fan Replacement . Is the repair complete? | - | Go to Step 29 | -- |
12 |
Does the voltage vary between the specified values? | 0.5-7.0 V | Go to Step 13 | Go to Step 18 |
13 | Use a test lamp in order to probe the blower motor control module harness connector between terminal A and terminal B. Does the test lamp light? | -- | Go to Step 14 | Go to Step 15 |
14 | Replace the blower motor control module. Refer to Blower Motor Control Module Replacement . Is the repair complete? | -- | Go to Step 29 | -- |
15 | Use a test lamp in order to probe between the blower motor control module harness connector terminal B and ground. Does the test lamp light? | -- | Go to Step 16 | Go to Step 17 |
16 | Locate and repair a poor connection or an open in circuit 150 between the blower motor control module harness connector terminal A and G200. Is the repair complete? | -- | Go to Step 29 | -- |
17 | Locate and repair a poor connection or an open in circuit 40 (ORN). Is the repair complete? | -- | Go to Step 29 | -- |
18 |
Does the test lamp light? | -- | Go to Step 19 | Go to Step 21 |
19 |
Does the test light illuminate? | -- | Go to Step 24 | Go to Step 20 |
20 | Locate and repair a poor connection or an open in circuit 541 (BRN) between the fuse block terminal B2 and the heater-A/C control harness connector terminal C5. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 29 | -- |
21 | Use a test lamp in order to probe between the heater-A/C control harness connector terminal C12 and the ground G200. Does the test lamp light? | -- | Go to Step 22 | Go to Step 23 |
22 | Locate and repair a poor connection or an open in circuit 150 (BLK) between the heater-A/C control harness connector terminal C1 and G200. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 29 | -- |
23 | Locate and repair a poor connection or an open in circuit 640 (ORN) between the underhood accessory wiring junction block harness connector C2 terminal F7 and the heater-A/C control harness connector terminal C12. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 29 | -- |
24 |
Is there continuity? | -- | Go to Step 26 | Go to Step 25 |
25 | Locate and repair a poor connection or an open in circuit 754 (GRY BLK) between the heater-A/C control harness connector terminal C11 and the blower motor control module harness connector terminal C. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 29 | -- |
26 |
Is there a short to B+ present? | -- | Go to Step 27 | Go to Step 28 |
27 | Locate and repair the short in circuit 754 (GRY BLK). Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 29 | -- |
28 | Replace the heater-A/C control. Refer to Control Assembly Replacement . Is the repair complete? | -- | Go to Step 29 | -- |
29 | Verfiy that the system operates poperly.
Does the system operate properly? | -- | System OK | Go to Diagnostic System Check |
