Dodge Ram 2004 - No Response from Compass Mini-Trip Computer

Symptom:
*NO RESPONSE FROM COMPASS MINI-TRIP COMPUTER
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE MIC
GROUND CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
COMPASS MINI-TRIP COMPUTER
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, attempt to communicate with the Instrument Cluster.
Was the DRB able to I/D or communicate with the MIC?
All
Yes → Go To 2
No → Refer to the symptom list for problems related to no communica-
tion with the MIC.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Disconnect the CMTC harness connector.
Using a 12-volt test light connected to 12-volts, probe the ground circuit.
Is the test light illuminated?
All
Yes → Go To 3
No → Repair the ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Disconnect the CMTC harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output circuit.
Is the test light illuminated?
All
Yes → Go To 4
No → Repair the Fused Ignition Switch Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
4 Turn the ignition off.
Disconnect the CMTC harness connector.
Using a 12-volt test light connected to ground, probe the Fused B(+) circuit.
Is the test light illuminated?
All
Yes → Go To 5
No → Repair the Fused B+ circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
266
COMMUNICATION