Chrysler Concorde 2004 Service Manual page 164

COMMUNICATION
*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE —
TEST
4 Turn the ignition off.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to 12-volts, probe both ground circuits.
Is the test light illuminated for both circuits?
Yes → Go To 5
→ Repair the ground circuit(s) for an open.
No
5 Turn the ignition off.
NOTE: Ensure fuse #17 is installed in the junction block.
Disconnect the CAB 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?
Yes → Go To 6
→ Repair the Fused Ignition Switch Output circuit for an open.
No
6 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 CAB 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 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 CAB 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?
Yes → Replace the Controller Antilock Brake (CAB) in accordance with
→ Go To 7
No
ACTION
Perform ABS VERIFICATION TEST - VER 1.
Perform ABS VERIFICATION TEST - VER 1.
the service information.
Perform ABS VERIFICATION TEST - VER 1.
148
Continued
APPLICABILITY
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All
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