Jeep Grand Cherokee WK. Manual — part 722
B145A-TELEMATICS MIRROR CONTROL CIRCUIT HIGH (CONTINUED)
2.
(X793) MICROPHONE FEED CIRCUIT OPEN
Turn the ignition off.
Disconnect the Hands Free Module harness connector.
Disconnect the Inside Rear View Mirror C2 harness connector.
Measure the resistance of the (X793) Microphone Feed circuit
between the HFM connector and the inside rear view mirror connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 3
No
>> Repair the (X793) Microphone Feed circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
3.
(X793) MICROPHONE FEED CIRCUIT SHORT TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (X793) Microphone Feed circuit.
Is the voltage above 1.0 volt?
Yes
>> Repair the (X793) Microphone Feed circuit for 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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NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
WK
B145A-TELEMATICS MIRROR CONTROL CIRCUIT HIGH (CONTINUED)
4.
INSIDE REAR VIEW MIRROR
Replace the Inside Rear View Mirror in accordance with the service information.
Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per
cycle.
Attempt to make a phone call with the system.
With the scan tool, read the active DTC’s.
Does the scan tool display this DTC as active?
Yes
>> Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Hands
Free Module in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No
>> Repair is complete.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
WK
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
8T - 35
B1459-TELEMATICS MIRROR CONTROL CIRCUIT LOW
8T - 36
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
WK
B1459-TELEMATICS MIRROR CONTROL CIRCUIT LOW (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The Hands Free Module detects low voltage on the (X793) Microphone Feed circuit.
Possible Causes
(X793) MICROPHONE FEED CIRCUIT OPEN
(X793) MICROPHONE FEED CIRCUIT SHORT TO GROUND
INSIDE REAR VIEW MIRROR
HANDS FREE MODULE
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC’s.
Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per
cycle.
Attempt to make a phone call with the system.
With the scan tool, read the active DTC’s.
Does the scan tool display this DTC as active?
Yes
>> Go To 2
No
>> If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness con-
nectors. Look for broken, bent, pushed out, or corroded terminals.
WK
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
8T - 37
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