Diagnostic Instructions

DTC Descriptors

DTC B1025 01: Audio Output 1 Left Front Circuit Short to Battery (LF Door)

DTC B1025 02: Audio Output 1 Left Front Circuit Short to Ground (LF Door)

DTC B1025 04: Audio Output 1 Left Front Circuit Open (LF Door)

DTC B1035 01: Audio Output 2 Right Front Circuit Short to Battery (RF Door)

DTC B1035 02: Audio Output 2 Right Front Circuit Short to Ground (RF Door)

DTC B1035 04: Audio Output 2 Right Front Circuit Open (RF Door)

DTC B1045 01:  Audio Output 3 Left Rear Circuit Short to Battery (LR Door)

DTC B1045 02:  Audio Output 3 Left Rear Circuit Short to Ground (LR Door)

DTC B1045 04:  Audio Output 3 Left Rear Circuit Open (LR Door)

DTC B1055 01:  Audio Output 4 Right Rear Circuit Short to Battery (RR Door)

DTC B1055 02:  Audio Output 4 Right Rear Circuit Short to Ground (RR Door)

DTC B1055 04:  Audio Output 4 Right Rear Circuit Open (RR Door)

DTC B1065 01:  Audio Output 5 Circuit Short to Battery (Center IP)

DTC B1065 02:  Audio Output 5 Circuit Short to Ground (Center IP)

DTC B1065 04:  Audio Output 5 Circuit Open (Center IP)

DTC B1075 01:  Audio Output 6 Circuit Short to Battery (Subwoofer)

DTC B1075 02:  Audio Output 6 Circuit Short to Ground (Subwoofer)

DTC B1085 01:  Audio Output 7 Circuit Short to Battery (LR Shelf)

DTC B1085 02:  Audio Output 7 Circuit Short to Ground (LR Shelf)

DTC B1085 04:  Audio Output 7 Circuit Open (LR Shelf)

DTC B1095 01:  Audio Output 8 Circuit Short to Battery (RR Shelf)

DTC B1095 02:  Audio Output 8 Circuit Short to Ground (RR Shelf)

DTC B1095 04:  Audio Output 8 Circuit Open (RR Shelf)

DTC B1105 01: Audio Output 9 Circuit Short to Battery (LF I/P Tweeter)

DTC B1105 02: Audio Output 9 Circuit Short to Ground (LF I/P Tweeter)

DTC B1105 04: Audio Output 9 Circuit Open (LF I/P Tweeter)

DTC B1115 01: Audio Output 10 Circuit Short to Battery (RF I/P Tweeter)

DTC B1115 02: Audio Output 10 Circuit Short to Ground (RF I/P Tweeter)

DTC B1115 04: Audio Output 10 Circuit Open (RF I/P Tweeter)

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Amplifier B+	--	2	--	--
Speaker Output Circuit (+)	B1XXX 02*,**	B1XXX 04*,**	B1XXX 01*,**	--
Speaker Output Circuit (-)	B1XXX 02*,**	B1XXX 04*,**	B1XXX 01*,**	--
Subwoofer Signal (+)	B1075 02,**	1	B1075 01,**	--
Subwoofer Signal (-)	B1075 02,**	1	B1075 01,**	--
Amplifier Control	B1287 02	B1287 04	B1287 01	--
Amplifier Ground	--	2	--	--
1. No or reduced sound from subwoofer 2. Amplifier inoperative/no sound from speaker * Sets associated speaker DTC with appropriate symptom type -- see DTC descriptors ** Noticeable audio distortion possible

Circuit/System Description

Each of the audio output channel circuits (+) and (-) have a varying AC mV signal that is produced by the radio and sent to the amplifier. The amplifier then processes these signals and passes the audio along with a DC bias voltage to the appropriate speakers. The audio being played on the system is produced by the varying AC voltage. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. When using a DMM, each of the audio amplifier output channel circuits will measure approximately 6.5V DC.

Conditions for Running the DTC

Conditions for Setting the DTC

B1025 01, B1035 01, B1045 01, B1055 01, B1065 01, B1075 01, B1085 01, B1095 01, B1105 01, B1115 01

The amplifier detects a short to voltage on the audio (+) or audio (-) circuit.

B1025 02, B1035 02, B1045 02, B1055 02, B1065 02, B1075 02, B1085 02, B1095 02, B1105 02, B1115 02

The amplifier detects a short to ground on the audio (+) or audio (-) circuit.

B1025 04, B1035 04, B1045 04, B1055 04, B1065 04, B1085 04, B1095 04, B1105 04, B1115 04

The amplifier detects an open on the audio (+) or audio (-) circuit.

Action Taken When the DTC Sets

The amplifier disables the audio output to the speaker with the current fault.

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Radio/Audio System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Radio ON, adjust the fade and balance controls on the radio to test all channels individually. Each channel should produce clear and even sound.

Circuit/System Testing

1. Ignition OFF, disconnect the X1 and X2 connectors at the amplifier.
2. Radio ON, test for less than 1 volt between the appropriate signal circuit terminal listed below and ground:

•	Left front tweeter speaker output (+) - terminal 4 X2

•	Left front tweeter speaker output (-) - terminal 5 X2

•	Right front tweeter speaker output (+) - terminal 7 X2

•	Right front tweeter speaker output (-) - terminal 6 X2

•	Left rear speaker output (+) - terminal 16 X2

•	Left rear speaker output (-) - terminal 8 X2

•	Right rear speaker output (+) - terminal 15 X2

•	Right rear speaker output (-) - terminal 14 X2

•	Front center speaker output (+) - terminal 13 X2

•	Front center speaker output (-) - terminal 12 X2

•	Left rear subwoofer speaker output (+) - terminal 5 X1

•	Left rear subwoofer speaker output (-) - terminal 6 X1

•	Right front speaker output (+) - terminal 7 X1

•	Right front speaker output (-) - terminal 3 X1

•	Left front speaker output (+) - terminal 1 X1

•	Left front speaker output (-) - terminal 2 X1

•	Right front speaker output (+) - terminal 7 X1

•	Right front speaker output (-) - terminal 3 X1

•	Left rear midrange speaker output (+) - terminal 11 X2

•	Left rear midrange speaker output (-) - terminal 10 X2

⇒	If greater than the specified range, test both circuits of the affected speaker for a short to voltage.

3. Radio ON, test for greater than 1 ohm between the appropriate signal circuit terminal listed below and ground:

•	Left front tweeter speaker output (+) - terminal 4 X2

•	Left front tweeter speaker output (-) - terminal 5 X2

•	Right front tweeter speaker output (+) - terminal 7 X2

•	Right front tweeter speaker output (-) - terminal 6 X2

•	Left rear speaker output (+) - terminal 16 X2

•	Left rear speaker output (-) - terminal 8 X2

•	Right rear speaker output (+) - terminal 15 X2

•	Right rear speaker output (-) - terminal 14 X2

•	Front center speaker output (+) - terminal 13 X2

•	Front center speaker output (-) - terminal 12 X2

•	Left rear subwoofer speaker output (+) - terminal 5 X1

•	Left rear subwoofer speaker output (-) - terminal 6 X1

•	Right front speaker output (+) - terminal 7 X1

•	Right front speaker output (-) - terminal 3 X1

•	Left front speaker output (+) - terminal 1 X1

•	Left front speaker output (-) - terminal 2 X1

•	Right front speaker output (+) - terminal 7 X1

•	Right front speaker output (-) - terminal 3 X1

•	Left rear midrange speaker output (+) - terminal 11 X2

•	Left rear midrange speaker output (-) - terminal 10 X2

⇒	If less than the specified range, test both circuits of the affected speaker for a short to ground.

4. If all circuits test normal, reconnect all harness connectors at the amplifier.
5. Ignition ON, radio ON, disconnect the appropriate speaker.
6. Test for 5.0-7.5 volts between the signal circuit terminals and ground.

⇒	If less then the specified range test the circuit for an open/high resistance. If the circuit tests normal, replace the amplifier.

7. If the circuit tests normal, test or replace the appropriate speaker.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.