Jeep XJ. Manual — part 538
Symptom:
LOSS OF IGNITION RUN ONLY - ACTIVE
When Monitored and Set Condition:
LOSS OF IGNITION RUN ONLY - ACTIVE
When Monitored:
With the ignition in the run only position the ACM monitors the Fused
Ignition Switch Output Run circuit for proper system voltage.
Set Condition:
If the voltage on the Fused Ignition Switch Output Run Only circuit drops
below 4.5 volts, the code will set.
POSSIBLE CAUSES
IGNITION SWITCH OUTPUT RUN CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT RUN CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT RUN CIRCUIT SHORT TO GROUND
OPEN AIRBAG FUSE
ACM, FUSED IGNITION OUTPUT RUN CIRCUIT OPEN
ACM, FUSED IGNITION RUN CIRCUIT SHORT TO GROUND
TEST
ACTION
APPLICABILITY
1
Remove Junction Block Airbag Run circuit fuse.
Note: Check connectors - Clean and repair as necessary.
Turn Ignition On ( Engine Off).
Measure the voltage on the Ignition Switch Output Run circuit at the Junction Block
Run circuit Fuse .
Is the voltage above 4.5 volts?
All
Yes
→
No
→
Repair the open Ignition Switch Output Run circuit.
Perform AIRBAG VERIFICATION TEST - VER 1.
2
Turn Ignition off.
Remove and inspect the Airbag Run Fuse.
Is the Fuse open?
All
Yes
→
No
→
Note: Reinstall the fuse if it is not open.
32
AIRBAG
TEST
ACTION
APPLICABILITY
3
Remove the Airbag Run fuse.
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY
TIME, IT MUST BE REPLACED.
Disconnect the Airbag Control Module connector.
NOTE: Check connectors - Clean and repair as necessary.
Measure the resistance of the Fused Ignition Switch Output Run circuit at the ACM
connector.
Is the resistance below 5.0 ohms ?
All
Yes
→
Repair the Fused Ignition Switch Output Run circuit for a short
to ground and replace Airbag Run Fuse.
Perform AIRBAG VERIFICATION TEST - VER 1.
No
→
NOTE: When reconnecting airbag system components the Ignition must be
turned off and the Battery must be disconnected.
4
Reconnect all preciously disconnected connectors and components.
Turn ignition off.
Install a new Fused Ignition Switch Output Run circuit Run fuse and turn the
ignition on.
Did the Fused Ignition Switch Output Run circuit fuse blow?
All
Yes
→
Replace the Airbag Control Module in accordance with Service
Instructions. WARNING: make sure the battery is disconnected
and wait 2 minutes before proceeding. Replace Airbag Run fuse.
Perform AIRBAG VERIFICATION TEST - VER 1.
No
→
The Airbag fuse was defective and has been replaced as part of the
previous test.
Perform AIRBAG VERIFICATION TEST - VER 1.
5
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY
TIME, IT MUST BE REPLACED.
Disconnect the Airbag Control Module connector.
NOTE: Check connectors - Clean and repair as necessary.
Turn Ignition On, then reconnect the Battery.
Measure the voltage of the Fused Ignition Switch Output Run circuit at the Airbag
Control Module connector.
Is the voltage above 4.5 volts?
All
Yes
→
No
→
Repair open Fused Ignition Switch Output Run circuit.
Perform AIRBAG VERIFICATION TEST - VER 1.
NOTE: When reconnecting airbag system components the Ignition must be
turned off and the Battery must be disconnected.
33
AIRBAG
LOSS OF IGNITION RUN ONLY - ACTIVE —
Continued
TEST
ACTION
APPLICABILITY
6
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY
TIME, IT MUST BE REPLACED.
View repair.
All
Repair
Replace the Airbag Control Module in accordance with Service
Instructions. WARNING: make sure the battery is disconnected
and wait 2 minutes before proceeding.
Perform AIRBAG VERIFICATION TEST - VER 1.
NOTE: When reconnecting airbag system components the Ignition must be
turned off and the Battery must be disconnected.
34
AIRBAG
LOSS OF IGNITION RUN ONLY - ACTIVE —
Continued
Symptom:
LOSS OF IGNITION RUN-START - ACTIVE
When Monitored and Set Condition:
LOSS OF IGNITION RUN-START - ACTIVE
When Monitored:
With the ignition in the Run-Start position the ACM monitors the
Fused Ignition Switch Output Run-Start circuit for proper system voltage.
Set Condition:
If the voltage on the Fused Ignition Switch Output Run-Start circuit drops
below 4.5 volts, the code will set.
POSSIBLE CAUSES
IGNITION SWITCH RUN - START CIRCUIT
AIRBAG RUN - START FUSE TEST
FUSED IGNITION SWITCH OUTPUT RUN - START CIRCUIT SHORT TO GROUND
FUSED IGNITION SWITCH OUTPUT RUN - START CIRCUIT OPEN
ACM, FUSED IGNITION SWITCH OUTPUT RUN - START SHORT TO GROUND
ACM, FUSED IGNITION OUTPUT RUN - START CIRCUIT OPEN
TEST
ACTION
APPLICABILITY
1
Remove Airbag Run - Start Fuse.
NOTE: Check connectors - Clean and repair as necessary.
Turn the ignition on.
Measure the voltage of the Ignition Switch Output circuit at the Airbag Run - Start
Fuse.
Is the voltage above 4.5 volts?
All
Yes
→
No
→
Repair the open Ignition Switch Output Run - Start circuit.
Perform AIRBAG VERIFICATION TEST - VER 1.
2
Turn Ignition off.
Remove and inspect the Airbag Run - Start Fuse.
Is the Fuse open?
All
Yes
→
No
→
Note: Reinstall the fuse if it is not open.
3
Remove the Airbag Run - Start Fuse.
Turn the ignition off.
Measure the resistance of the Fused Ignition Switch Output Run/Start circuit at the
Airbag Run - Start Fuse.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Replace Airbag Run - Start Fuse.
Perform AIRBAG VERIFICATION TEST - VER 1.
35
AIRBAG
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