Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
|
Important: Zero the J 39200 Digital Multimeter (DMM) before taking measurements. This will avoid misdiagnosis. | ||||
1 | Did you perform the HVAC Blower Controls System Check? | -- | Go to Step 2 | Refer to HVAC Blower Controls System Check |
2 | Inspect for HVAC DTCs. Are HVAC DTCs present? | -- | Refer to DTC Table | Go to Step 3 |
3 | Inspect the radio fuse for an open. Is the radio fuse open? | -- | Go to Step 4 | Go to Step 5 |
4 | Locate and repair a short to ground in CKT 640 (ORN). Is the repair complete? | -- | System OK | -- |
5 | Inspect the DIC/HVAC fuse for an open. Is the DIC/HVAC fuse open? | -- | Go to Step 6 | Go to Step 7 |
6 | Locate and repair a short to ground in CKT 541 (BRN). Is the repair complete? | System OK | -- | |
7 | Inspect the HVAC HI fuse for an open. Is the HVAC HI fuse open? | - | Go to Step 8 | Go to Step 9 |
8 | Locate and repair a short to the ground in CKT 40 (ORN). Is the repair complete? | - | System OK | -- |
9 | Inspect the ground G 200 . Is the ground clean and tight? | - | Go to Step 11 | Go to Step 10 |
10 | Clean and tighten ground G 200. Is the repair complete? | - | System OK | -- |
11 |
Does the test light illuminate? | - | Go to Step 12 | Go to Step 13 |
12 | Replace the blower motor. Refer to Blower Motor and Fan Replacement . Is the repair complete? | - | System OK | -- |
13 |
Does the voltage vary between the specified values? | 0.5-7.0 V | Go to Step 14 | Go to Step 19 |
14 | Use a test lamp to probe the blower motor control module harness connector between terminal A and terminal B. Does the test lamp light ? | -- | Go to Step 15 | Go to Step 16 |
15 | Replace the blower motor control module. Refer to Blower Motor Control Module Replacement . Is the repair complete? | -- | System OK | -- |
16 | Use a test lamp to probe between the blower motor control module harness connector terminal B and ground. Does the test lamp light ? | -- | Go to Step 17 | Go to Step 18 |
17 | Locate and repair a poor connection or an open in CKT 150 between the blower motor control module harness connector terminal A and G200. Is the repair complete? | -- | System OK | -- |
18 | Locate and repair a poor connection or an open in CKT 40 (ORN). Is the repair complete? | -- | System OK | -- |
19 |
Does the test lamp light ? | -- | Go to Step 20 | Go to Step 22 |
20 |
Does the test light illuminate? | -- | Go to Step 25 | Go to Step 21 |
21 | Locate and repair a poor connection or an open in CKT 541 (BRN) between the fuse block terminal B 2 and the heater-A/C control harness connector terminal C 5. Is the repair complete? | -- | System OK | -- |
22 | Use a test lamp to probe between the heater-A/C control harness connector terminal C 12 and the ground G 200. Does the test lamp light ? | -- | Go to Step 23 | Go to Step 24 |
23 | Locate and repair a poor connection or an open in CKT 150 (BLK) between the heater-A/C control harness connector terminal C 1 and G 200. Is the repair complete? | -- | System OK | -- |
24 | Locate and repair a poor connection or an open in CKT 640 (ORN) between the Underhood Accessory Wiring Junction Block harness connector C 2 terminal F 7 and the heater-A/C control harness connector terminal C 12. Is the repair complete? | -- | System OK | -- |
25 |
Does continuity exist? | -- | Go to Step 27 | Go to Step 26 |
26 | Locate and repair a poor connection or an open in CKT 754 (GRY BLK) between the heater-A/C control harness connector terminal C 11 and the blower motor control module harness connector terminal C. Is the repair complete? | -- | System OK | -- |
27 |
Did you find a short to B+ present? | -- | Go to Step 28 | Go to Step 29 |
28 | Locate and repair the short in CKT 754 (GRY BLK). Is the repair complete? | -- | System OK | -- |
29 | Replace the heater-A/C control. Refer to Control Assembly Replacement . Is the repair complete? | -- | System OK | -- |
