Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) CHECK FOR AN INTERMITTENT CONDITION

Fig 1: Scan Tool - Starscan
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition on.

Turn the radio on.

With the scan tool, erase Amplifier DTCs.

With the scan tool, reset the amplifier.

With the scan tool, read Amplifier DTCs.

Does the scan tool display active: B1488-CABIN EQ MISMATCH PERFORMANCE?

Yes
1. Go To step 2).
No
1. The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. Perform BODY VERIFICATION TEST - VER 1 .
2) CHECK AMPLIFIER BUSSED INPUTS/OUTPUTS
With the scan tool in Amplifier Data Display, read the Cabin EQ# settings in the Bussed Inputs and Bussed Outputs Sections.

NOTE: The Cabin EQ# settings in the Inputs/Outputs section should match one another. The Cabin EQ# in the Inputs section is the information that is received form the FCM. The Cabin EQ# in the Outputs section is the information that is Stored in the Amplifier's memory.

The Cabin EQ# settings are as follows:
- *$51: HB Premium 1 (w/o Subwoofer)
1. *$52: HB Premium 2 (with Subwoofer)
Do the Cabin EQ# settings match one another?

Yes
1. Replace the Amplifier in accordance to the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 3).
3) VERIFY COMMUNICATION WITH FRONT CONTROL MODULE
With the scan tool in ECU VIEW, read active modules on the bus.

Does the scan tool show the Front Control Module active on the bus?

Yes
1. Go To step 4).
No
1. Refer to the Communication category for the related symptoms.
2. Perform BODY VERIFICATION TEST - VER 1 .
4) CHECK FRONT CONTROL MODULE FOR ACTIVE DTCs
With the scan tool, erase FCM DTCs.

Turn the ignition off. Wait approximately 10 seconds.

Turn the ignition on.

With the scan tool, read FCM DTCs.

Are any active DTCs present?

Yes
1. Refer to symptom list for problems related to the Front Control Module.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace the Front Control Module in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .