B147F
B147F-CHANNEL 7 AUDIO SPEAKER OUTPUT CIRCUIT LOWB147F-Channel 7 Audio Speaker Output Circuit Low:
WHEN MONITORED
With the ignition on.
SET CONDITION
The Amplifier detects a shorted to ground condition on the speaker output circuit.
POSSIBLE CAUSES
- (X300) amplified subwoofer 1(+) circuit shorted to ground
- (X390) amplified subwoofer 1 (-) circuit shorted to ground
- Subwoofer
- Amplifier
DIAGNOSTIC TEST
1. CHECK FOR AN INTERMITTENT CONDITION
Turn the ignition on, then off, and then on again.
With the scan tool, read Amplifier DTCs.
Q: Does the scan tool display active: B147F-CHANNEL 7 AUDIO SPEAKER OUTPUT CIRCUIT LOW?
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 THE (X300) AMPLIFIED SUBWOOFER 1 (+) CIRCUIT FOR A SHORT TO GROUND
Disconnect the Amplifier C1 harness connector.
Measure the resistance between ground and the (X300) Amplified Subwoofer 1 (+) circuit.
Q: Is the resistance below 10K ohms?
YES: Repair the (X300) Amplified Subwoofer 1 (+) circuit for a short to ground. Perform BODY VERIFICATION TEST VER-1. Body Verification Test
NO: Go To 3
3. CHECK THE (X390) AMPLIFIED SUBWOOFER 1 (-) CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (X390) Amplified Subwoofer 1 (-) circuit.
Q: Is the resistance below 10K ohms?
YES: Repair the (X390) Amplified Subwoofer 1 (-) for a short to ground. Perform BODY VERIFICATION TEST VER-1. Body Verification Test
NO: Go To 4
4. CHECK OPERATION OF THE AMPLIFIED SUBWOOFER
Turn the ignition off.
Reconnect the Subwoofer harness connector.
Measure the resistance of the speaker circuit between the Amplifier C1 harness connector and ground..
Q: Is the resistance below 10K ohms?
YES: Replace the Subwoofer 1. Perform BODY VERIFICATION TEST VER-1. Body Verification Test
NO: Replace the Amplifier. Perform BODY VERIFICATION TEST VER-1. Body Verification Test