C1402

C1402- TRANSFER CASE RANGE SELECT SWITCH CIRCUIT HIGH





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on.

- Set Condition:
Transfer Case Range Select Switch voltage greater than 4.86 volts for 5.0 seconds





Diagnostic Test

1. TCASE (DTCM) SWITCH VOLTAGE ABOVE 4.8 VOLTS
Ignition on, engine not running.
With the scan tool, read the TCASE Switch voltage in the Cluster.
Is the voltage above 4.8 volts?

Yes

- Go To 2

No

- Go to 7

2. (K77) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT SHORTED TO VOLTAGE




Turn the ignition off to the lock position.
Disconnect the Transfer Case Selector Switch connector.
Ignition on, engine not running.
Measure the voltage of the (K77) 5 Volt Selector Switch Supply circuit.
Is the voltage above 5.5 volts?

Yes

- Repair the (K77) 5 Volt Selector Switch Supply circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 3

3. (K977) MODE SELECT CIRCUIT SHORTED TO VOLTAGE




Measure the voltage of the (K977) Mode Select circuit.
Is there any voltage present?

Yes

- Repair the (K977) Mode Select circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 4

4. (K77) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT OPEN




Turn the ignition off to the lock position
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance of the (K77) 5 Volt Selector Switch Supply circuit between the Transfer Case Selector Switch harness connector and the Instrument Cluster C1 harness connector.
Is the resistance greater than 5.0 ohms?

Yes

- Repair the (K77) 5 Volt Selector Switch Supply circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go To 5

5. (K977) MODE SELECT CIRCUIT OPEN




Turn the ignition off to the lock position.
Disconnect the Instrument Cluster C2 harness connector.
Measure the resistance of the (K977) Mode Select circuit between the Transfer Case Selector Switch harness connector and the Instrument Cluster C2 harness connector.
Is the resistance above 5.0 ohms?

Yes

- Repair the (K977) Mode Select circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go To 6

6. TRANSFER CASE SELECTOR SWITCH INTERNALLY SHORTED TO VOLTAGE
Reconnect the Instrument Cluster C2 harness connector.
Ignition on, engine not running.
With the scan tool, read the TCASE Switch voltage in the Cluster.
Is DTC C1402 still present?

Yes

- Replace the Instrument Cluster.
- Perform the BODY VERIFICATION TEST-VER 1. Body Verification Test

No

- Replace the Transfer Case Selector Switch.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

7. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Were any problems found?

Yes

- Repair as necessary.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Test complete.