Circuit Description
The body control module (PZM) may command the park lamps through a discrete output to the park lamp relay. Grounding this output also grounds the park lamps input to the instrument cluster.
Conditions for Setting the DTC
A short to ground is tested for under the following conditions:
| • | The exterior lamp power is inactive. |
| • | The parklamp output is active. |
| • | The headlamp switch is not active. |
| • | DTC B1970 is not current. |
A short to battery is tested for under the following conditions:
| • | The exterior lamp power is active. |
| • | The parklamp output is active. |
| • | DTC B1970 is not current. |
Action Taken When the DTC Sets
The PZM continues to command the state requested until the state is achieved or the request changes.
Conditions for Clearing the DTC
The feedback state matches the commanded state.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Body Control Module Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Are the park lamps OFF? | -- | Go to Step 3 | Go to Step 4 |
3 | Turn the headlamp switch ON. Are the park lamps on? | -- | Go to Step 5 | Go to Step 6 |
4 |
Are the park lamps OFF? | -- | Go to Step 7 | Go to Step 8 |
5 | Cycle the ignition. Is DTC B2476 now history? | -- | Go to Step 12 | Go to Step 11 |
6 | Test for an open in CKT 308 (GRY/BLK). Was an open found? | -- | Go to Step 16 | Go to Step 15 |
7 |
Is the resistance within the specified value? | 0-5 ohms | Go to Step 9 | Go to Step 10 |
8 | Test for a short to ground in CKT 308 (GRY/BLK). Was a short found? | -- | Go to Step 16 | Go to Step 14 |
9 | Repair the short to ground in CKT 308 (GRY/BLK). Is the repair complete? | -- | -- | |
10 | Replace the headlamp switch. Refer to Headlamp Switch Replacement in Lighting Systems. Is the repair complete? | -- | -- | |
11 | Test for an open in CKT 308 (GRY/BLK). Was an open found? | -- | Go to Step 16 | Go to Step 14 |
12 | Repair the intermittent short to battery positive voltage in CKT 308 (GRY/BLK). Is the repair complete? | -- | -- | |
13 | Replace the park lamp relay. Is the repair complete? | -- | -- | |
14 | Replace the PZM. Refer to Body Control Module Replacement . Is the repair complete? | -- | -- | |
15 | Test for an open in CKT 352 (WHT). Was an open found? | -- | Go to Step 17 | Go to Step 13 |
16 | Repair the short or the open in CKT 308 (GRY/BLK). Is the repair complete? | -- | -- | |
17 | Repair the open or the short to ground in CKT 352 (WHT). Is the repair complete? | -- | -- |
