Chrysler 300M 1999 Manual page 631

TEST 1A
IDENTIFYING VEHICLE COMMUNICATION PROBLEMS
Perform TEST SYMPTOM IDENTIFICATION 1A Before Proceeding
Use a DRB with the latest software to interrogate the suspect module(s) for diagnostic trouble codes
(DTCs) and DRB bus failure messages.
Choose the applicable failure/no response from the list below and perform the indicated test.
If the DRB has a blank screen:
1. Disconnect the DRB from the data link connector.
2. Ensure that there is a good ground at cavities 4 & 5 (see Fig. 1)
3. Ensure that there is a 12-volt supply at cavity 16 (see Fig. 1). If there is not, inspect the IOD fuse
in the junction block.
4. Try a different DRB cable.
5. Try a different DRB.
NOTE: If the odometer is displaying "NO BUS" attempt to communicate with the instrument cluster
and follow the appropriate test listed below.
NO RESPONSE FROM
Airbag Control Module (ACM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 2A
Automatic Temperature Control (ATC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 3A
Body Control Module (BCM)
(Also: diagnostic trouble code ''Battery Power to Module Disconnected'') . . . . . . . . . . . .TEST 4A
Controller Anti-Lock Brakes (CAB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 5A
Mechanical Instrument Cluster (MIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 6A
Overhead Traveler Information System (OTIS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 7A
Powertrain Control Module (PCM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 8A
Radio (PCI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 9A
Transmission Control Module (TCM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 10A
Sentry Key Immobilizer Module (SKIM) . . . . . . . . . . . . .refer to the Powertrain Diagnostic Manual.
Memory Heated Seat and Memory Mirror (MHSMM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 11A
BUS FAILURE MESSAGES
Shorted to Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 12A
Shorted to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 13A
BUS SYMPTOMS
No Fused Ignition Switch Output to BCM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST 14A
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