B1488

B1488-CABIN EQ MISMATCH PERFORMANCE

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.

POSSIBLE CAUSES
- No communication with front control module
- Active FCM DTCs
- Amplifier

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.

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

YES: Go To 2
NO: 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. Body Verification Test

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.

NOTE: The Cabin EQ# settings in the Inputs/Outputs should match one another. The Cabin EQ# in the Inputs is the information that is received form the FCM. The Cabin EQ# in the Outputs 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)

Q: Do the Cabin EQ# settings match one another?

YES: Replace the Amplifier. Perform the BODY VERIFICATION TEST-VER 1.
NO: Go To 3

3. VERIFY COMMUNICATION WITH FRONT CONTROL MODULE
With the scan tool in ECU VIEW, read active modules on the bus.

Q: the scan tool show the Front Control Module active on the bus?

YES: Go To 4
NO: Refer to the Communication category for the related symptoms Perform the BODY VERIFICATION TEST VER-1. Body Verification Test

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.

Q: 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. Body Verification Test
NO: Replace the Front Control Module. Perform the BODY VERIFICATION TEST-VER.1