Dodge Ram. Manual — part 66
Symptom:
FCM - VIN NOT LEARNED CORRECTLY
When Monitored and Set Condition:
FCM - VIN NOT LEARNED CORRECTLY
When Monitored:
With the ignition on.
Set Condition:
The VIN is programmed into the FCM via PCI Bus messages from the
PCM/ECM. When learning the VIN, the FCM computes a check digit to verify that the VIN
learned was valid. If not valid, the DTC will set and the VIN will not be learned.
POSSIBLE CAUSES
VIN NOT LEARNED CORRECTLY
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase FCM DTC’s.
Turn the ignition off then turn the ignition on and wait approximately 1 minute.
With the DRB, read FCM DTC’s.
Did this DTC reset?
All
Yes
→ Replace the Front Control Module in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
261
COMMUNICATION
Symptom:
*NO RESPONSE FROM AIRBAG CONTROL MODULE
POSSIBLE CAUSES
CHECKING FOR VOLTAGE AT ACM
GROUND CIRCUIT OPEN
PCI BUS CIRCUIT OPEN
AIRBAG CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Ensure that the battery is fully charged.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNI-
TION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BE-
FORE PROCEEDING.
Disconnect the ACM harness connector.
Connect the appropriate Load Tool ACM Adapter to the ACM connector.
Turn the ignition on and then reconnect the Battery.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output (Run) Circuit and the Fused Ignition Switch Output (Run/Start) Circuit at
the ACM connector.
NOTE: One open circuit will not cause a NO RESPONSE condition.
Is the test light illuminated on both circuits?
All
Yes
→ Go To 2
No
→ Repair the Fused Ignition Switch Output (Run) and Fused
Ignition Switch Output (Run/Start) circuits for an open.
Perform __AIRBAG VERIFICATION TEST - VER 1.
NOTE: When reconnecting airbag system components, the ignition must be
turned off and the battery must be disconnected.
2
Ensure that the battery is fully charged.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNI-
TION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BE-
FORE PROCEEDING.
Disconnect the ACM harness connector.
Connect the appropriate Load Tool ACM Adapter to the ACM connector.
Using a 12-volt test light connected to 12-volts, probe the ground circuit.
NOTE: Make sure test light is connected to the Battery positive terminal.
Is the test light illuminated?
All
Yes
→ Go To 3
No
→ Repair the Ground circuit for an open.
Perform __AIRBAG VERIFICATION TEST - VER 1.
When reconnecting Airbag system components, the ignition must be turned
off and the battery must be disconnected.
262
COMMUNICATION
TEST
ACTION
APPLICABILITY
3
Note: Ensure there is PCI bus communication with other modules. If not,
refer to the PCI Bus Communication Failure symptom and repair as
necessary.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNI-
TION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BE-
FORE PROCEEDING.
Disconnect the ACM harness connector.
Connect the appropriate Load Tool ACM Adapter to the ACM connector.
Turn the ignition on and then reconnect the Battery.
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and
black test probes.
Connect the scope input cable to the channel one connector on the DRB. Attach the
red and black leads and the cable to probe adapter to the scope input cable.
With the DRBIII
t select Pep Module Tools.
Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again
when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the ACM connector.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?
All
Yes
→ Replace the Airbag Control Module in accordance with the Service
lnformation. WARNING: Make sure the battery is disconnected
and wait 2 minutes before proceeding.
Perform __AIRBAG VERIFICATION TEST - VER 1.
No
→ Repair the PCI Bus circuit for an open.
Perform __AIRBAG VERIFICATION TEST - VER 1.
263
COMMUNICATION
*NO RESPONSE FROM AIRBAG CONTROL MODULE —
Continued
Symptom:
*NO RESPONSE FROM AMPLIFIER
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE RADIO
GROUND CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
AMPLIFIER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: The Radio must be turned on for the DRB to get a response from the
Amplifier.
With the DRB, attempt to communicate with the Radio.
Was the DRB able to I/D or communicate with the Radio?
All
Yes
→ Go To 2
No
→ Refer to the symptom list for problems related to no communica-
tion with the Radio.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Amplifier C1 harness connector.
Using a 12-volt test light connected to 12-volts, probe both ground circuits.
Is the test light illuminated for both circuits?
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 Amplifier C2 harness connector.
Using a 12-volt test light connected to ground, probe both Fused B(+) circuits.
Is the test light illuminated for both circuits?
All
Yes
→ Go To 4
No
→ Check IPM fuse #21 for an open. If OK, repair the Fused B+
circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
264
COMMUNICATION
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