Jeep XJ. Manual — part 571
Symptom:
G-SWITCH NOT PROCESSABLE
When Monitored and Set Condition:
G-SWITCH NOT PROCESSABLE
When Monitored:
Ignition on. The CAB sends a test signal out to the G-switch and
monitors the sense circuits #1 and #2.
Set Condition:
If the sense circuits are open for 2 minutes while driving or an otherwise
improper signal is detected at any time, the Diagnostic Trouble Code (DTC) is set.
POSSIBLE CAUSES
G-SWITCH TEST SIGNAL CIRCUIT OPEN
INTERMITTENT DTC
G-SWITCH TEST SIGNAL OR SENSE CIRCUIT SHORT TO VOLTAGE OR GROUND
G-SWITCH SIGNAL CIRCUIT INTERNAL OPEN
CAB - TEST SIGNAL CIRCUIT OPEN
G-SWITCH #1 SENSE CIRCUIT OPEN
G-SWITCH #1 SENSE SWITCH OPEN
CAB - #1 SENSE CIRCUIT OPEN
G-SWITCH #2 SENSE CIRCUIT OPEN
G-SWITCH #2 SENSE SWITCH OPEN
CAB - #2 SENSE CIRCUIT OPEN
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the status of the G-Switch internal switches.
What is the status of both of the G-Switches?
All
Both G-Switches are closed.
Both G-Switches are open.
Only the #1 G-Switch is open.
Only the #2 G-Switch is open.
15
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
2
Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→
Test Complete.
3
Turn the ignition off.
Disconnect the CAB connector.
Check connector - Clean/repair as necessary.
Disconnect the G-Switch Sensor Connector.
NOTE: Check connector - Clean/repair as necessary.
Measure the resistance of the G-Switch Test Signal circuit.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the G-Switch Test Signal Circuit Open.
Perform ABS VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the CAB Connector.
Check connector - Clean/repair as necessary.
Disconnect the G-Switch Sensor Connector.
Check connector - Clean/repair as necessary.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Test Signal and both Sense
circuits.
Using a 12-volt test light connected to 12-volts, check the Test Signal and both Sense
circuits.
CAUTION: The test light should not light at any test point.
Does the test light illuminate at any test point?
All
Yes
→
Repair the G-Switch Test Signal or Sense circuit for a short to
voltage or ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→
5
Turn the ignition off.
Disconnect the G-Switch Connector.
Check connector - Clean/repair as necessary.
Remove G-Switch from vehicle.
While holding the G-Switch level, measure the resistance of the G-Switch Test Signal
circuit and the G-Switch #1 Sense circuit in the G-Switch connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Replace G-Switch.
Perform ABS VERIFICATION TEST - VER 1.
16
BRAKES (CAB)
G-SWITCH NOT PROCESSABLE —
Continued
TEST
ACTION
APPLICABILITY
6
If there are no potential causes remaining, view repair.
All
Repair
Replace the CAB.
Perform ABS VERIFICATION TEST - VER 1.
7
Turn the ignition off.
Disconnect the CAB Connector.
Note: Check connector - Clean/repair as necessary.
Disconnect the G-Switch Sensor Connector.
Measure the resistance of the G-Switch #1 Sense Circuit.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the G-Switch #1 Sense circuit open.
Perform ABS VERIFICATION TEST - VER 1.
8
Turn the ignition off.
Check connector - Clean/repair as necessary.
Remove G-Switch from vehicle.
While holding the G-Switch level, measure the resistance of the G-Switch Test Signal
circuit and the G-Switch #1 Sense circuit in the G-Switch connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Replace G-Switch Assembly.
Perform ABS VERIFICATION TEST - VER 1.
9
If there are no potential causes remaining, view repair.
All
Repair
Replace the CAB.
Perform ABS VERIFICATION TEST - VER 1.
10
Turn the ignition off.
Disconnect the CAB Connector.
Note: Check connector - Clean/repair as necessary.
Disconnect the G-Switch Connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the G-Switch #2 Sense Circuit.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the G-Switch #2 Sense Circuit Open.
Perform ABS VERIFICATION TEST - VER 1.
11
Turn the ignition off.
Disconnect the G-Switch connector.
Note: Check connector - Clean/repair as necessary.
Remove the G-Switch from vehicle.
While holding the G-Switch level, measure the resistance of the G-Switch Test Signal
circuit and the G-Switch #2 Sense circuit in the G-Switch connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Replace the G-Switch Assembly.
Perform ABS VERIFICATION TEST - VER 1.
17
BRAKES (CAB)
G-SWITCH NOT PROCESSABLE —
Continued
TEST
ACTION
APPLICABILITY
12
If there are no potential causes remaining, view repair.
All
Repair
Replace the CAB.
Perform ABS VERIFICATION TEST - VER 1.
18
BRAKES (CAB)
G-SWITCH NOT PROCESSABLE —
Continued
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