Jeep Grand Cherokee WK. Manual — part 512
U1001–CAN B BUS (-) CIRCUIT– MEMORY MIRROR MODULE (CONTINUED)
For the Power Memory Mirror System circuit diagram (Refer to 8 - ELECTRICAL/POWER MIRRORS - SCHEMAT-
ICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition in the run position.
•
Set Condition:
If the Driver / Passenger Memory Mirror Module senses that the (D54) Can B Bus (-) circuit is either open, or
shorted to voltage, or shorted to ground, or shorted together.
Possible Causes
FOR THE DRIVER MEMORY MIRROR SYSTEM:
ACTIVE CAN B BUS DTCs IN FRONT CONTROL MODULE (FCM)
(D54) CAN B BUS (-) CIRCUIT OPEN TO DRIVER MEMORY MIRROR MODULE
DRIVER MEMORY MIRROR MODULE
FOR THE PASSENGER MEMORY MIRROR SYSTEM:
ACTIVE CAN B BUS DTCs IN FRONT CONTROL MODULE (FCM)
(D54) CAN B BUS (-) CIRCUIT OPEN TO PASSENGER MEMORY MIRROR MODULE
PASSENGER MEMORY MIRROR MODULE
NOTE: Since this DTC can set in the Driver Door Module (DDM) and in the Passenger Door Module (PDM)
this procedure addresses both systems’ circuits and components. Select only that which applies to the sys-
tem you are diagnosing.
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase DTCs.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read DTCs.
Does the scan tool display: U1001 CAN B BUS (-) CIRCUIT?
Yes
>> Go To 2
No
>> The conditions that caused this code to set are not present at this time. Using the wiring diagram/sche-
matic as a guide, inspect the wiring and connectors.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
2.
CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE (FCM)
With the scan tool, read Front Control Module (FCM) DTCs
Does the scan tool display any active CAN B BUS related DTCs?
Yes
>> Diagnose and repair the DTC(s). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES -
DIAGNOSIS AND TESTING).
No
>> Go To 3
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POWER MIRRORS - ELECTRICAL DIAGNOSTICS
WK
U1001–CAN B BUS (-) CIRCUIT– MEMORY MIRROR MODULE (CONTINUED)
3.
CHECK THE (D54) CAN B BUS (-) CIRCUIT FOR AN OPEN BETWEEN THE FRONT CONTROL MODULE &
THE DRIVER / PASSENGER MEMORY MIRROR MODULE
For the Driver Memory Mirror System, proceed as follows:
•
Turn the ignition off.
•
Disconnect the Driver Memory Mirror Module C1 connector.
•
Disconnect the Front Control Module C1 connector.
•
Measure the resistance of the (D54) Can B Bus (-) circuit
between the Front Control Module C1 connector and the Driver
Memory Mirror Module C1 connector.
For the Passenger Memory Mirror System, proceed as follows:
•
Turn the ignition off.
•
Disconnect the Passenger Memory Mirror Module connector.
•
Disconnect the Front Control Module C1 connector.
•
Measure the resistance of the (D54) Can B Bus (-) circuit
between the Front Control Module C1 connector and the Passen-
ger Memory Mirror Module connector.
Is the resistance below 2.0 ohms?
Yes, Driver MMM
Replace the Driver Memory Mirror Module in accordance
with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
Yes, Passenger MMM
Replace the Passenger Memory Mirror Module in accor-
dance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No
>> Repair the (D54) Can B Bus (-) circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
WK
POWER MIRRORS - ELECTRICAL DIAGNOSTICS
8N - 209
SCHEMATICS AND DIAGRAMS
POWER
MEMOR
Y
MIRRORS
SYSTEM
8N - 210
POWER MIRRORS - ELECTRICAL DIAGNOSTICS
WK
POWER MIRRORS-SERVICE INFORMATION
TABLE OF CONTENTS
page
page
POWER MIRRORS-SERVICE INFORMATION
. . . . . . . . . . . . . . . . . . . . . . . . 211
. . . . . . . . . . . . . . . . . . . . . . . . . . 211
. . . . . . . . . . . . . . . . . . . 211
MIRROR-INSIDE REARVIEW
. . . . . . . . . . . . . . . . . . . . . . . . 212
. . . . . . . . . . . . . . . . . . . . . . . . . . 212
SWITCH-MIRROR
. . . . . . . . . . . . . . . . . . . . . . . . 213
. . . . . . . . . . . . . . . . . . . . . . . . . . 214
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
. . . . . . . . . . . . . . . . . . . . . . . . 215
POWER MIRRORS-SERVICE INFORMATION
DESCRIPTION
AUTOMATIC DAY/NIGHT MIRROR
The automatic day/night mirror system is able to automatically change the reflectance of the inside rear view mirror
in order to reduce the glare of headlamps approaching the vehicle from the rear. The automatic day/night rear view
mirror receives battery current through a fuse in the junction block only when the ignition switch is in the On posi-
tion.
OUTSIDE REAR VIEW MIRROR
The power operated rear view mirrors allow the driver to adjust both outside mirrors electrically from the driver side
front seat position by operating a switch on the driver side front door trim panel. The power mirrors receive a non-
switched battery feed through a fuse in the junction block so that the system will remain operational, regardless of
the ignition switch position.
OPERATION
AUTOMATIC DAY/NIGHT MIRROR
A switch located on the bottom of the automatic day/night mirror housing allows the vehicle operator to select
whether the automatic dimming feature is operational. When the automatic day/night mirror is turned on, the mirror
switch is lighted by an integral Light-Emitting Diode (LED). The mirror will automatically disable its self-dimming
feature whenever the vehicle is being driven in reverse.
DIAGNOSIS AND TESTING
POWER MIRRORS
For complete circuit diagrams, refer to the appropriate wiring information.
1. Check the fuses in the Power Distribution Center (PDC) and the junction block. If OK, go to Step 2. If not OK,
repair the shorted circuit or component as required and replace the faulty fuse(s).
2. Check for battery voltage at the fuse in the junction block. If OK, go to Step 3. If not OK, repair the open circuit
to the PDC as required.
3. Disconnect and isolate the battery negative cable. Remove the driver side power window switch and bezel
assembly and unplug the wire harness connector from the power mirror switch. Connect the battery negative
cable. Check for battery voltage at the fused B(+) circuit cavity in the door wire harness half of the power mirror
switch wire harness connector. If OK, go to Step 4. If not OK, repair the open circuit to the junction block as
required.
WK
POWER MIRRORS-SERVICE INFORMATION
8N - 211
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