Jeep Grand Cherokee WK. Manual — part 536
POWER TOP - ELECTRICAL DIAGNOSIS
TABLE OF CONTENTS
page
page
POWER TOP - ELECTRICAL DIAGNOSIS
B1841–SUNROOF OPEN SWITCH INPUT
CIRCUIT HIGH . . . . . . . . . . . . . . . . . . . . . . . 305
B1844–SUNROOF CLOSE SWITCH INPUT
CIRCUIT HIGH . . . . . . . . . . . . . . . . . . . . . . . 309
B1847–SUNROOF VENT SWITCH INPUT
CIRCUIT HIGH . . . . . . . . . . . . . . . . . . . . . . . 313
CIRCUIT/PERFORMANCE (STALLED) . . . . . 317
FRONT CONTROL MODULE . . . . . . . . . . . . 320
CLUSTER/CCN . . . . . . . . . . . . . . . . . . . . . . 320
. . . . . . . . . . . . . . . . . . . 321
SUNROOF . . . . . . . . . . . . . . . . . . . . . . . . . . 324
POWER TOP - ELECTRICAL DIAGNOSIS
DIAGNOSIS AND TESTING
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POWER TOP - ELECTRICAL DIAGNOSIS
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B1841–SUNROOF OPEN SWITCH INPUT CIRCUIT HIGH
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POWER TOP - ELECTRICAL DIAGNOSIS
8N - 305
B1841–SUNROOF OPEN SWITCH INPUT CIRCUIT HIGH (CONTINUED)
For the Sunroof circuit diagram (Refer to 8 - ELECTRICAL/POWER TOP - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The Sunroof Motor/Module supplies a 12 volt supply circuit to the sunroof switch. When the switch is closed to any
of the 3 sense circuits (open, close or vent), it sends that command back to the module.
•
When Monitored:
Whenever the Sunroof module is awake.
•
Set Condition:
Whenever the module has determined that the open switch has been applied for over 15 seconds or there is
a short to voltage on the Sunroof Open Switch Sense circuit, this code will set.
Possible Causes
(Q3) SUNROOF OPEN SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
(Q3) SUNROOF OPEN SWITCH SENSE CIRCUIT SHORT TO (Q6) SUNROOF SWITCH SUPPLY CIRCUIT
SUNROOF SWITCH SHORTED
SUNROOF MOTOR/MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase DTC’s
Press and release the Sunroof Switch in all positions several times.
Wait 30 seconds.
With the scan tool, read DTC’s.
Does the scan tool display B1841–SUNROOF OPEN SWITCH
INPUT CIRCUIT LOW?
Yes
>> Go To 2
No
>> The conditions that caused this code to set are not
present at this time. Check the switch for any binding con-
ditions and using the wiring diagram/schematic as a guide,
inspect the wiring and connectors.
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POWER TOP - ELECTRICAL DIAGNOSIS
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B1841–SUNROOF OPEN SWITCH INPUT CIRCUIT HIGH (CONTINUED)
2.
SUNROOF SWITCH SHORTED
With the scan tool, erase DTC’s.
Turn the ignition off.
Disconnect the Sunroof Switch connector.
Turn the ignition on and wait 30 seconds.
With the scan tool, read DTC’s.
Does the scan tool display B1841–SUNROOF OPEN SWITCH
INPUT CIRCUIT LOW?
Yes
>> Go To 3
No
>> Replace the Sunroof Switch.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE)
3.
(Q3) SUNROOF OPEN SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
NOTE: To further diagnose the sunroof, it is necessary to lower
or remove the headliner.
Turn the ignition off.
Lower the headliner to gain access to the Sunroof Motor/Module con-
nector.
Disconnect the Sunroof Motor/Module connector.
NOTE: Ensure the A-Pillar connector is connected before pro-
ceeding.
Turn the ignition on.
Measure the voltage between the (Q3) Sunroof Open Switch Sense
circuit and Ground.
Is the voltage above 0.4 volts?
Yes
>> Repair the (Q3) Sunroof Open Switch Sense circuit for a
short to voltage.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
>> Go To 4
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POWER TOP - ELECTRICAL DIAGNOSIS
8N - 307
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