Jeep Grand Cherokee WK. Manual — part 1005
P0571-BRAKE SWITCH 1 PERFORMANCE (CONTINUED)
4.
(B16) BRAKE SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (B16) Brake Switch
No.2 Signal circuit in the Stop Lamp Switch harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (B16) Brake Switch No.2
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
(Z904) GROUND CIRCUIT OPEN
Measure the resistance between ground and the (Z904) Ground circuit
in the Stop Lamp Switch harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the open in the (Z904) Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
6.
STOP LAMP SWITCH
Measure the resistance between the (Z904) Ground circuit terminal and the (B15) Brake Switch No.1 Signal terminal
in the Stop Lamp Switch.
Next, measure the resistance between the (F942) Fused Ignition Switch Output circuit terminal and the (B16) Brake
Switch No.2 Signal circuit terminal in the Stop Lamp Switch.
Apply and release the Stop Lamp Switch while monitoring the ohmmeter.
Does the resistance change from below 5.0 ohms to an open circuit for one or both of the measurements
taken?
Yes
>> Go To 7
No
>> Replace the Stop Lamp Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 616
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0571-BRAKE SWITCH 1 PERFORMANCE (CONTINUED)
7.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 617
P0572-BRAKE SWITCH 1 STUCK ON
9 - 618
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0572-BRAKE SWITCH 1 STUCK ON (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on.
•
Set Condition:
When the PCM recognizes Brake Switch No.1 is mechanically stuck in the low/on position. Two Trip Fault.
Three Global Good Trips to Clear.
Possible Causes
(B15) BRAKE SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO GROUND
(B16) BRAKE SWITCH NO.2 SIGNAL CIRCUIT OPEN
STOP LAMP SWITCH
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
NOTE: Verify battery voltage is greater than 10 volts.
With a scan tool, read DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
STOP LAMP SWITCH
Turn the ignition off.
Remove the Stop Lamp Switch and disconnect the harness connector.
Measure the resistance between the (Z940) Ground circuit terminal and the (B15) Brake Switch No.1 Signal terminal
in the Stop Lamp Switch.
Measure the resistance between the (F942) Fused Ignition Switch Output circuit terminal and the (B16) Brake
Switch No.2 Signal circuit terminal in the Stop Lamp Switch.
Apply and release the Stop Lamp Switch plunger while monitoring the ohmmeter.
Does the resistance change from below 5.0 ohms to an open circuit?
Yes
>> Go To 3
No
>> Replace the Stop Lamp Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 619
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