Dodge Ram. Manual — part 79
Symptom:
*COMPASS TEST FAILURE
POSSIBLE CAUSES
COMPASS/MINI-TRIP COMPUTER
TEST
ACTION
APPLICABILITY
1
Perform the CMTC self test.
Turn the ignition off.
Depress and hold the RESET and C/T buttons while turning the ignition on.
NOTE: This test may also be performed using the DRBIII
t.
Does the CMTC or DRBIII
t display 9FAILED SELF TEST9?
All
Yes
→ Replace the CMTC in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
313
COMPASS/MINI-TRIP COMPUTER
Symptom:
*TEMPERATURE DISPLAY INACCURATE OR INOPERATIVE
POSSIBLE CAUSES
AMBIENT TEMPERATURE SENSOR
COMPASS/MINI-TRIP COMPUTER
TEST
ACTION
APPLICABILITY
1
NOTE: Diagnose and repair any FCM, CMTC, PCM, or Communication
DTCs before proceeding with this test.
NOTE: The Ambient Temperature Sensor is hardwired to the FCM (Diesel),
or to the PCM. Ambient temperature information is transmitted to the
CMTC via the PCI Bus.
Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Measure the resistance of the Ambient Temperature Sensor using the following
temperature/resistance values:
10°C (50°F) Sensor Resistance = 17.99 - 21.81 Kilohms
20°C (68°F) Sensor Resistance = 11.37 - 13.61 Kilohms
25°C (77°F) Sensor Resistance = 9.12 - 10.88 Kilohms
30°C (86°F) Sensor Resistance = 7.37 - 8.75 Kilohms
40°C (104°F) Sensor Resistance = 4.90 - 5.75 Kilohms
50°C (122°F) Sensor Resistance = 3.33 - 3.88 Kilohms
Is the Ambient Temperature Sensor resistance measurement within the min/max
specifications?
All
Yes
→ Go To 2
No
→ Replace the Ambient Temperature Sensor.
Perform BODY VERIFICATION TEST - VER 1.
2
Perform the CMTC self test.
Turn the ignition off.
Press and hold the C/T and Reset buttons.
Turn the ignition on.
NOTE: The self test can also be performed using the DRBIII
t.
Observe the CMTC display at the conclusion of the self test.
Does the CMTC display
9Passed Self Test9?
All
Yes
→ Test Complete.
No
→ Replace and configure the CMTC in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
314
COMPASS/MINI-TRIP COMPUTER
Symptom:
*DRIVER DOOR AJAR CIRCUIT OPEN
POSSIBLE CAUSES
DRIVER DOOR AJAR SWITCH
DRIVER DOOR AJAR SWITCH GROUND CIRCUIT OPEN
DRIVER DOOR AJAR SWITCH SENSE CIRCUIT OPEN
INSTRUMENT CLUSTER -DRIVER DOOR AJAR OPEN
TEST
ACTION
APPLICABILITY
1
Disconnect the Driver Door Ajar Switch connector.
Connect a jumper wire between the Sense circuit and the Ground circuit.
With the DRBIII
t in Inputs/Outputs, read the DRV DOOR AJAR SW state.
Does the DRBIII
t display CLOSED?
All
Yes
→ Replace the Driver Door Ajar Switch.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Disconnect the Driver Door Ajar switch connector.
Using a 12-volt Test Light connected to 12-volts, test the Ground circuit for
continuity.
Does the test light illuminate brightly?
All
Yes
→ Go To 3
No
→ Repair the Driver Door Ajar Switch Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3
Disconnect the Driver Door Ajar Switch connector.
Disconnect the Instrument Cluster C3 harness connector.
Measure the resistance of the Driver Door Ajar Switch Sense circuit between the
Instrument Cluster connector and the Door Ajar Switch connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the Driver Door Ajar Switch Sense circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
4
If there are no possible causes remaining, view repair.
All
Repair
Replace the Instrument Cluster.
315
DOOR AJAR
Symptom:
*DRIVER DOOR AJAR CIRCUIT SHORTED TO GROUND
POSSIBLE CAUSES
DRIVER DOOR AJAR SWITCH SHORTED TO GROUND
DRIVER DOOR AJAR SWITCH SENSE CIRCUIT SHORTED TO GROUND
INSTRUMENT CLUSTER - DRIVER DOOR AJAR SHORTED
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t in Inputs/Outputs, read the DRV DOOR AJAR SW state.
While monitoring the DRBIII
t, disconnect the Driver Door Ajar Switch harness
connector.
Did the Switch State change from CLOSED to OPEN?
All
Yes
→ Replace the Driver Door Ajar Switch.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Disconnect the Driver Door Ajar Switch harness connector.
Disconnect the Instrument Cluster C3 harness connector.
Using a 12-volt test light connected to 12-volts, probe the Driver Door Ajar Switch
Sense circuit and test for a short to ground.
Does the test light illuminate brightly?
All
Yes
→ Repair the Driver Door Ajar Switch Sense circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
If there are no possible causes remaining, view repair.
All
Repair
Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
316
DOOR AJAR
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