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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