Jeep Grand Cherokee WK. Manual — part 539
B1847–SUNROOF VENT SWITCH INPUT CIRCUIT HIGH (CONTINUED)
4.
(Q4) SUNROOF VENT SWITCH SENSE CIRCUIT SHORT TO (Q6) SUNROOF SWITCH SUPPLY CIRCUIT
Turn the ignition off.
Disconnect the A-Pillar connector.
Measure the resistance between the (Q4) Sunroof Vent Switch Sense
circuit and the (Q6) Sunroof Switch Supply circuit in the Sunroof
Motor/Module connector.
Is the resistance below 1000.0 ohms?
Yes
>> Repair the (Q4) Sunroof Vent Switch Sense circuit for a
short to the (Q6) Sunroof Switch Supply circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE)
No
>> Replace the Sunroof Motor/Module.
Perform the Sunroof Position Calibration, (Refer to 8 - ELECTRICAL/POWER TOP/MOTOR - STAN-
DARD PROCEDURE - SUNROOF POSITION CALIBRATION). Perform the Excessive Force Limitation
Calibration, (Refer to 8 - ELECTRICAL/POWER TOP/MOTOR - STANDARD PROCEDURE - EXCES-
SIVE FORCE LIMITATION CALIBRATION).
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
8N - 316
POWER TOP - ELECTRICAL DIAGNOSIS
WK
B1849–SUNROOF MOTOR CONTROL CIRCUIT/PERFORMANCE (STALLED)
For the Sunroof circuit diagram (Refer to 8 - ELECTRICAL/POWER TOP - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Whenever the Sunroof motor/module is in motion.
•
Set Condition:
Whenever the sunroof motor/module is attempting to move the sunroof in response to the input switches (or in
response to an obstacle), and it doesn’t appear to be responding correctly. This code is usually set when there
is some type of binding in the sunroof mechanism.
Possible Causes
SUNROOF MOTOR/MODULE
MECHANICAL BINDING, STICKING OR CABLES OUT OF CALIBRATION
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase DTC’s
Operate the Sunroof Switch in all positions several times.
Wait 30 seconds.
With the scan tool, read DTC’s.
Does the scan tool display B1849–SUNROOF MOTOR CON-
TROLCIRCUIT/PERFORMANCE (STALLED)?
Yes
>> Go To 2
No
>> The conditions that caused this code to set are not
present at this time. Check for any binding or sticking
conditions.
WK
POWER TOP - ELECTRICAL DIAGNOSIS
8N - 317
B1849–SUNROOF MOTOR CONTROL CIRCUIT/PERFORMANCE (STALLED) (CONTINUED)
2.
SUNROOF MOTOR
NOTE: To further diagnose the sunroof, it is necessary to lower or remove the headliner.
NOTE: Any time the Sunroof Motor is removed, it is necessary to perform the Position Calibration when the
motor is re-installed.
Turn the ignition off.
Lower the headliner to gain access to the Sunroof Motor/Module.
Remove the Sunroof Motor/Module from the sunroof.
NOTE: Ensure the A-Pillar connector is connected before proceeding.
Turn the ignition on.
While holding the motor firmly in your hand, have an assistant press the sunroof switch Open and after the motor
stops press Close (NOT VENT) several times and observe the motor operation.
Did the motor operate smoothly and powerful?
Yes
>> Repair or replace the sunroof mechanism as necessary in accordance with Service Information.Perform
BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES
- STANDARD PROCEDURE)
No
>> Replace the Sunroof Motor Module.
Perform the Sunroof Position Calibration. (Refer to 8 - ELECTRICAL/POWER TOP/MOTOR - STAN-
DARD PROCEDURE) Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES - STANDARD PROCEDURE)
8N - 318
POWER TOP - ELECTRICAL DIAGNOSIS
WK
B2227–SUNROOF ECU INTERNAL
For the Sunroof circuit diagram (Refer to 8 - ELECTRICAL/POWER TOP - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Whenever the Sunroof module is awake.
•
Set Condition:
Whenever the module has determined that there is a motor or electronic malfunction, this code will set.
Possible Causes
SUNROOF MOTOR/MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase DTC’s
Operate the Sunroof Switch in all positions several times.
Wait 30 seconds.
With the scan tool, read DTC’s.
Does the scan tool display B2227–SUNROOF ECU INTERNAL?
Yes
>> Replace the Sunroof Motor/Module.
Perform the Sunroof Position Calibration, (Refer to 8 -
ELECTRICAL/POWER TOP/MOTOR - STANDARD PRO-
CEDURE - SUNROOF POSITION CALIBRATION). Per-
form the Excessive Force Limitation Calibration, (Refer to
8 - ELECTRICAL/POWER TOP/MOTOR - STANDARD
PROCEDURE - EXCESSIVE FORCE LIMITATION CALI-
BRATION).
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
>> The conditions that caused this code to set are not present at this time. Operate the Sunroof several
times and recheck for DTC’s. If the code reappears now or later, replace the Sunroof Motor/Module.
WK
POWER TOP - ELECTRICAL DIAGNOSIS
8N - 319
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