Circuit Description
The transfer case shift control module controls the SERVCE indicator (AWD/4WD) lamp, located in the instrument cluster, by grounding CKT 1567. Voltage to the lamp is supplied via the GAUGE Fuse, CKT 39. The fuse is located in the IP Fuse Block.
Conditions for Setting the DTC
After the transfer case shift control module commands the lamp on, the module senses a voltage greater than 7 V on CKT 1567.
Conditions for Clearing the MIL/DTC
| • | The transfer case shift control module will clear the DTC if the condition for setting the DTC no longer exists. |
| • | A history DTC will clear after 100 consecutive ignition cycles without a fault present. |
| • | Use a scan tool in order to clear history DTCs. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
This step determines whether circuit 1567 is shorted to voltage.
-
Jumping terminal E2 of the transfer case shift control module harness connector to ground should provide a complete path to ground for the SERVICE indicator (AWD/4WD) lamp. This step attempts to eliminate the instrument cluster and wiring from fault.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Transfer Case Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Are the terminals damaged or corroded? | -- | Go to Step 5 | Go to Step 3 |
Is the voltage reading greater than the specified voltage? | 0 V | Go to Step 4 | Go to Step 6 | |
4 | Repair a short to voltage in CKT 1567. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 11 | -- |
5 | Repair the instrument cluster wire harness connector. Refer to Connector Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 11 | -- |
Does the SERVICE indicator (AWD/4WD) lamp light? | -- | Go to Step 7 | Go to Step 8 | |
7 | Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement . Is the action complete? | -- | Go to Step 11 | -- |
8 | Inspect instrument cluster SERVICE indicator (AWD/4WD) lamp for faulty bulb. Is the bulb good? | -- | Go to Step 10 | Go to Step 9 |
9 | Replace instrument cluster SERVICE indicator (AWD/4WD) bulb. Refer to Instrument Cluster Bulb Replacement in Instrument Cluster. Is the repair complete? | -- | Go to Step 11 | -- |
10 | Remove instrument cluster for service. Refer to Instrument Cluster Replacement in Instrument Cluster. Is the repair complete? | -- | Go to Step 11 | -- |
11 |
Have all the ATC components been reconnected and properly mounted? | -- | Go to Step 12 | -- |
12 | Clear all ATC DTCs. Have all the ATC DTCs been cleared? | -- | -- |
