Chrysler Town, Dodge Caravan. Manual — part 785
Symptom:
*NO RESPONSE FROM HVAC
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE BCM
GROUND CIRCUIT OPEN
IGNITION SWITCH OUTPUT CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
A/C HEATER CONTROL
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, enter Body then Body Computer.
Was the DRB able to I/D or communicate with the BCM?
All
Yes
→ Go To 2
No
→ Refer to the symptom list for problems related to no communica-
tion with the BCM.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the A/C Heater Control C1 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 A/C Heater Control C1 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Ignition Switch Output
circuit.
Is the test light illuminated?
All
Yes
→ Go To 4
No
→ Repair the Ignition Switch Output circuit for an open or short.
Perform BODY VERIFICATION TEST - VER 1.
376
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Note: Ensure there is PCI Bus communication with other modules on the
vehicle before proceeding. If not, refer to the symptom list from the menu
and repair as necessary.
Disconnect the A/C Heater Control C1 harness connector.
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. Set the probe to x10.
Press F2 again when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the A/C Heater Control connector.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?
All
Yes
→ Go To 5
No
→ Repair the PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the A/C Heater Control in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
377
COMMUNICATION
*NO RESPONSE FROM HVAC —
Continued
Symptom:
*NO RESPONSE FROM INSTRUMENT CLUSTER
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE BCM
OPEN GROUND CIRCUIT
OPEN FUSED B+ CIRCUIT
OPEN PCI BUS CIRCUIT
INSTRUMENT CLUSTER WAKE UP SENSE CKT OPEN
INSTRUMENT CLUSTER WAKE UP SENSE CKT INTERNALLY OPEN
INSTRUMENT CLUSTER WAKE UP SENSE CKT SHORTED TO VOLTAGE
INSTRUMENT CLUSTER WAKE UP SENSE CKT INTERNALLY SHORTED TO VOLTAGE
INSTRUMENT CLUSTER
BODY CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, enter Body then Body Computer.
Was the DRB able to I/D or communicate with the BCM?
All
Yes
→ Go To 2
No
→ Refer to the symptom list for problems related to no communica-
tion with the BCM.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Instrument Cluster harness connector.
Using a 12-volt test light connected to 12-volts, probe both ground circuits.
Is the test light illuminated for each circuit?
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 Instrument Cluster 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 4
No
→ Repair the Fused B+ circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
378
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Note: Ensure there is PCI Bus communication with other modules on the
vehicle before proceeding. If not, refer to the symptom list from the menu
and repair as necessary.
Disconnect the Instrument Cluster harness connector.
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.
Install DRBIII
t SuperCard 2 CH8361 into DRBIIIt.
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. Set Probe to x10.
Press F2 again when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the Instrument Cluster connector.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?
All
Yes
→ Go To 5
No
→ Repair the PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
5
Turn the ignition off.
Reconnect the Instrument Cluster harness connector.
Disconnect the BCM C4 harness connector.
Turn the ignition on.
Measure the voltage of the Instrument Cluster Wake Up Sense circuit in the BCM C4
connector.
Is the voltage above 10.0 volts?
All
Yes
→ Go To 6
No
→ Go To 9
6
Turn the ignition off.
Disconnect the BCM C4 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Instrument Cluster Wake
Up Sense circuit.
Is the test light illuminated?
All
Yes
→ Go To 7
No
→ Go To 8
379
COMMUNICATION
*NO RESPONSE FROM INSTRUMENT CLUSTER —
Continued
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