Jeep Grand Cherokee WK. Manual — part 391
B2336–HORN CONTROL CIRCUIT LOW – FCM (CONTINUED)
2.
CHECK THE HORN FUSE
Turn the ignition off.
Remove and inspect the Horn fuse.
Is the Horn Fuse open?
Yes
>> Go To 3
No
>> Reinstall the Horn Fuse. Then, Go To 7.
3.
CHECK FOR A SHORTED HORN RELAY
Install a known good relay in place of the Horn Relay.
Replace the Horn fuse.
Turn the ignition on.
With the scan tool, record and erase DTCs.
Operate the Horn Switch several times.
Cycle the ignition from on to off 3 times and leave on.
With the scan tool, read DTCs.
Does the scan tool display: B2336 HORN CONTROL CIRCUIT
LOW?
Yes
>> Go To 4
No
>> Replace the original Horn Relay.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
8H - 4
HORN - ELECTRICAL DIAGNOSTICS
WK
B2336–HORN CONTROL CIRCUIT LOW – FCM (CONTINUED)
4.
CHECK THE (A43) FUSED B(+) CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Remove the Horn Relay.
Remove the Horn Fuse.
Measure the resistance of the (A43) Fused B(+) circuit between
ground and Cavity 86 of the Horn Relay connector in the Integrated
Power Module (IPM).
Measure the resistance of the (A43) Fused B(+) circuit between
ground and Cavity 30 of the Horn Relay connector in the Integrated
Power Module (IPM).
Is the resistance below 10000.0 ohms?
Yes
>> Replace the Integrated Power Module (IPM) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Go To 5
5.
CHECK THE (X4) HORN RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
Remove the Front Control Module (FCM) in accordance with the Ser-
vice Information.
Measure the resistance of the (X4) Horn Relay Control circuit between
ground and Cavity 85 of the Horn Relay connector in the Integrated
Power Module (IPM).
Is the resistance below 10000.0 ohms?
Yes
>> Replace the Integrated Power Module (IPM) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Replace the Front Control Module (FCM) in accordance
with the Service Information. Then, Go To 6.
WK
HORN - ELECTRICAL DIAGNOSTICS
8H - 5
B2336–HORN CONTROL CIRCUIT LOW – FCM (CONTINUED)
6.
CHECK FOR A SHORTED INTEGRATED POWER MODULE (IPM)
Install the original Horn Relay.
Replace the Horn fuse.
Turn the ignition on.
With the scan tool, record and erase DTCs.
Operate the Horn Switch several times.
Cycle the ignition from on to off 3 times and leave on.
With the scan tool, read DTCs.
Does the scan tool display: B2336 HORN CONTROL CIRCUIT
LOW?
Yes
>> Replace the Integrated Power Module (IPM) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
7.
CHECK FOR POWER TO THE HORN FUSE
Turn the ignition on.
Using a 12-volt test light connected to ground, check for power to the
Horn Fuse.
Does the test light illuminate brightly?
Yes
>> Go To 8
No
>> Repair the (A1) / (A913) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
8H - 6
HORN - ELECTRICAL DIAGNOSTICS
WK
B2336–HORN CONTROL CIRCUIT LOW – FCM (CONTINUED)
8.
CHECK FOR AN OPEN HORN RELAY
Turn the ignition off.
Install a known good relay in place of the Horn Relay.
Turn the ignition on.
With the scan tool, record and erase DTCs.
Operate the Horn Switch several times.
Cycle the ignition from on to off 3 times and leave on.
With the scan tool, read DTCs.
Does the scan tool display: B2336 HORN CONTROL CIRCUIT
LOW?
Yes
>> Go To 9
No
>> Replace the original Horn Relay.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
9.
CHECK THE (A43) FUSED B(+) CIRCUIT FOR AN OPEN
Turn the ignition off.
Remove the Horn Relay.
Remove the Horn Fuse.
Measure the resistance of the (A43) Fused B(+) circuit between the
Horn Fuse (output cavity) and Cavity 86 of the Horn Relay connector
in the Integrated Power Module (IPM).
Measure the resistance of the (A43) Fused B(+) circuit between the
Horn Fuse (output cavity) and Cavity 30 of the Horn Relay connector
in the Integrated Power Module (IPM).
Is the resistance below 5.0 ohms?
Yes
>> Go To 10
No
>> Replace the Integrated Power Module (IPM) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
WK
HORN - ELECTRICAL DIAGNOSTICS
8H - 7
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