B1488-CABIN EQ MISMATCH PERFORMANCE

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on.
Set Condition:
If the cabin EQ message is incompatible with the EQ's stored in the amplifier for 10 consecutive cycles, then the amplifier will set this DTC.

NO COMMUNICATION WITH FRONT CONTROL MODULE

Diagnostic Test

1. CHECK FOR AN INTERMITTENT CONDITION

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

Go To 2

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

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 from the TIPM. 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)

•$52: HB Premium 2 (with Subwoofer)

Do the Cabin EQ settings match one another?

Yes

Replace the Amplifier in accordance to the service information.

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

Go To 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

Go To 4

Refer to the Communication category for the related symptoms.
Perform the BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

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

Refer to symptom list for problems related to the Front Control Module.

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

Replace the Front Control Module in accordance with the Service Information.
Perform the BODY VERIFICATION TEST-VER.1 (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)