Jeep Grand Cherokee WK. Manual — part 508
B1D53–SWITCH POWER SUPPLY CIRCUIT LOW — DRIVER MEMORY MIRROR
MODULE
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:
Continuously
•
Set Condition:
If the Driver Memory Mirror Module detects an internal module failure.
Possible Causes
DRIVER MEMORY MIRROR MODULE
Diagnostic Test
1.
REPLACE THE DRIVER MEMORY MIRROR MODULE
Repair
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).
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POWER MIRRORS - ELECTRICAL DIAGNOSTICS
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B210D–BATTERY VOLTAGE LOW – MEMORY MIRROR MODULE
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:
Continuously
•
Set Condition:
If the Driver / Passenger Memory Mirror Module senses voltage is less than 8.5 volts on the (A931) Fused
B(+) circuit.
POSSIBLE CAUSES
FOR THE DRIVER MEMORY MIRROR SYSTEM:
BATTERY / CHARGING SYSTEM
(A931) FUSED B(+) CIRCUIT SHORTED
(A931) FUSED B(+) CIRCUIT OPEN
(Z911) GROUND CIRCUIT(S) OPEN
DRIVER MEMORY MIRROR MODULE
FOR THE PASSENGER MEMORY MIRROR SYSTEM:
BATTERY / CHARGING SYSTEM
(A931) FUSED B(+) CIRCUIT SHORTED
(A931) FUSED B(+) CIRCUIT OPEN
(Z908) GROUND CIRCUIT OPEN
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.
CHECK FOR ENGINE DTCs
Turn the ignition on.
With the scan tool, read engine DTCs.
Does the scan tool display any BATTERY VOLTAGE LOW related DTCs?
Yes
>> Diagnose and repair the DTC(s). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) for the diagnostic
test procedure(s).
No
>> Go To 2
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POWER MIRRORS - ELECTRICAL DIAGNOSTICS
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B210D–BATTERY VOLTAGE LOW – MEMORY MIRROR MODULE (CONTINUED)
2.
VERIFY THAT THE DRIVER DOOR MODULE (DDM) OR PASSENGER DOOR MODULE (PDM) IS ACTIVE
ON THE BUS
NOTE: Ensure that the IOD fuse is installed and that battery voltage is between 10.0 and 16.0 volts.
With the scan tool, select ECU view.
NOTE: A red X will display next to the module that is not communicating, indicating that the module is not
active on the Bus network. A green check indicates that the module is active on the Bus network.
Does the scan tool display a red X next to the Driver or Passenger Door Module (DDM or PDM)?
Yes
>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No
Response diagnostic test procedures.
No
>> Go To 3
3.
TEST FOR INTERMITTENT CONDITION
With the scan tool, record and erase DTCs
Start the engine and run for 2 minutes.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read DTCs.
Does the scan tool display: B210D BATTERY VOLTAGE LOW?
Yes
>> Go To 4
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).
4.
CHECK FOR POWER ON THE (A931) FUSED B(+) CIRCUIT AT THE DRIVER OR 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.
•
Turn the ignition on.
•
Measure the voltage of the (A931) Fused B(+) circuit.
For the Passenger Memory Mirror System, proceed as follows:
•
Turn the ignition off.
•
Disconnect the Passenger Memory Mirror Module connector.
•
Turn the ignition on.
•
Measure the voltage of the (A931) Fused B(+) circuit.
Is the voltage above 8.5 volts?
Yes
>> Go To 5
No
>> Repair the (A931) Fused B(+) circuit for an open or short.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
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POWER MIRRORS - ELECTRICAL DIAGNOSTICS
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B210D–BATTERY VOLTAGE LOW – MEMORY MIRROR MODULE (CONTINUED)
5.
CHECK THE (Z911) OR THE (Z908) GROUND CIRCUITS FOR AN OPEN
For the Driver Memory Mirror System, proceed as follows:
•
Measure the resistance between ground and both of the (Z911) ground circuits in the Driver Memory Mirror
Module C1 connector.
For the Passenger Memory Mirror System, proceed as follows:
•
Measure the resistance between ground and the (Z908) ground circuit in the Passenger Memory Mirror Module
connector.
It 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 accordance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No, Driver MMM
Repair the (Z911) ground circuit(s) for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No, Passenger MMM
Repair the (Z908) ground circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
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POWER MIRRORS - ELECTRICAL DIAGNOSTICS
8N - 195
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