Jeep Grand Cherokee WK. Manual — part 724

B1492–GENERAL MICROPHONE PERFORMANCE (CONTINUED)

2.

(X712) MICROPHONE 1 IN (+) 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 (X712) Microphone 1 IN (+) 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 (X712) Microphone 1 IN (+) circuit for an open.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).

3.

(X722) MICROPHONE 2 IN (+) CIRCUIT OPEN

Measure the resistance of the (X722) Microphone 2 IN (+) circuit
between the HFM connector and the inside rear view mirror connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 4

No

>> Repair the (X722) Microphone 2 IN (+) circuit for an open.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).

8T - 42

NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

WK

B1492–GENERAL MICROPHONE PERFORMANCE (CONTINUED)

4.

(X792) MICROPHONE IN (-) CIRCUIT OPEN

Measure the resistance of the (X792) Microphone IN (-) circuit
between the HFM connector and the inside rear view mirror connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 5

No

>> Repair the (X792) Microphone IN (-) circuit for an open.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).

5.

(X712) (X722) (X792) MICROPHONE CIRCUITS SHORTED TO GROUND

Measure the resistance between ground and each (X712) (X722)
(X792) Microphone circuit.

Is the resistance below 100.0 ohms?

Yes

>> Repair the Microphone circuit that measured below 100.0

ohms for short to ground.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).

No

>> Go To 6

WK

NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

8T - 43

B1492–GENERAL MICROPHONE PERFORMANCE (CONTINUED)

6.

(X712) (X722) (X792) MICROPHONE CIRCUITS SHORTED TO VOLTAGE

Turn the ignition on.

Measure the voltage of each (X712) (X722) (X792) Microphone circuit.

Is the voltage above 1.0 volt?

Yes

>> Repair the Microphone circuit that measured above 1.0

volt for short to voltage.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).

No

>> Go To 7

7.

(X712) (X722) (X792) MICROPHONE CIRCUITS SHORTED TOGETHER

Turn the ignition off.

Measure the resistance between each (X712) (X722) (X792) Micro-
phone circuit.

Is the resistance below 100.0 ohms?

Yes

>> Repair the Microphone circuit that measured below 100.0

ohms for a short together.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).

No

>> Go To 8

8T - 44

NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS

WK

B1492–GENERAL MICROPHONE PERFORMANCE (CONTINUED)

8.

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 - 45