DTC B1025, B1035, B1045, or B1055
Diagnostic Instructions
DTC Descriptors
| DTC B1025 01: Left Front Audio Output Circuit
Short to Battery |
| DTC B1025 02: Left Front Audio Output Circuit
Short to Ground |
| DTC B1025 04: Left Front Audio Output Circuit
Open |
| DTC B1035 01: Front Audio Output Circuit Short
to Battery |
| DTC B1035 02: Right Front Audio Output Circuit
Short to Ground |
| DTC B1035 04: Right Front Audio Output Circuit
Open |
| DTC B1045 01: Left Rear Audio Output Circuit
Short to Battery |
| DTC B1045 02: Left Rear Audio Output Circuit
Short to Ground |
| DTC B1045 04: Left Rear Audio Output Circuit
Open |
| DTC B1055 01: Right Rear Audio Output Circuit
Short to Battery |
| DTC B1055 02: Right Rear Audio Output Circuit
Short to Ground |
| DTC B1055 04: Right Rear Audio Output Circuit
Open |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Amplifier B+
|
-
|
1
|
-
|
-
|
Left Front Low Level Audio Signal
|
B1025 02, *
|
B1025 04, *
|
B1025 01, *
|
-
|
Right Front Low Level Audio Signal
|
B1035 02, *
|
B1035 04, *
|
B1035 01, *
|
-
|
Left Rear Low Level Audio Signal
|
B1045 02, *
|
B1045 04, *
|
B1045 01, *
|
-
|
Right Rear Low Level Audio Signal
|
B1055 02*
|
B1055 04*
|
B1055 01, *
|
-
|
Subwoofer Low Level Audio Signal
|
2
|
2
|
2
|
-
|
Center Low Level Audio Signal
|
3
|
3
|
3
|
-
|
Amplifier Ground
|
-
|
1
|
-
|
-
|
1. Amplifier inoperative/no sound from subwoofers.
2. No or reduced sound from subwoofer.
3. No sound from center speaker.
* Noticeable audio distortion possible.
|
|
| |
Circuit/System Description
Each of the audio output channel circuits (+) and (-), at the
radio and audio amplifier have a DC bias voltage that is one half
of the battery voltage. When using a DMM, each of the audio output
channel circuits will measure approximately 6.5V DC. The audio
being played on the system is produced by a varying AC voltage that
is centered around the DC bias voltage on the same circuit. 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. Low volume and talk settings will
measure around 1V AC and less, where constant music may measure 3V
AC and slightly higher. The amplifier can not set DTCs.
Conditions for Running the DTC
| • |
The ignition is in the RUN or
ACC position. |
| • |
The system voltage is at least
9.5 volts and no more than 15.5 volts. |
| • |
All the above conditions are
present for greater than 10 seconds. |
Conditions for Setting the DTC
B1025 01, B1035 01, B1045 01, B1055 01
The radio detects a short to voltage on the audio (+) or audio (-)
circuit.
B1025 02, B1035 02, B1045 02, B1055 02
The radio detects a short to ground on the audio (+) or audio (-)
circuit.
B1025 04, B1035 04, B1045 04, B1055 04
The radio detects an open on the audio (+) or audio (-) circuit.
Action Taken When the DTC Sets
The radio disables the audio output to the speaker signal
circuit with the current fault.
Conditions for Clearing the DTC
| • |
A current DTC clears when the
conditions for setting the DTC are no longer present and the
ignition has been cycled from OFF to ON. |
| • |
A history DTC clears after 50
malfunction-free ignition cycles. |
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
Without Amplifier
| 1. |
Ignition OFF, disconnect the
harness connector at the appropriate speaker. |
| 2. |
Radio ON, test for 4-8 V
between the signal circuit terminal A and ground. |
| ⇒ |
If less than the specified range, test the signal
circuit for a short to ground or an open/high resistance. If the
circuit tests normal, replace the A11 radio. |
| ⇒ |
If greater than the specified range, test the
signal circuit for a short to voltage. If the circuit tests normal,
replace the A11 radio. |
| 3. |
Test for 4-8 V between the
signal circuit terminal B and ground. |
| ⇒ |
If less than the specified range, test the signal
circuit for a short to ground or an open/high resistance. If the
circuit tests normal, replace the A11 radio. |
| ⇒ |
If greater than the specified range, test the
signal circuit for a short to voltage. If the circuit tests normal,
replace the A11 radio. |
| 4. |
If all circuits test normal,
replace the speaker. |
With Amplifier
| 1. |
Ignition OFF, disconnect the
X3 harness connector at the T3 amplifier. |
| 2. |
Radio ON, test for 4-8 V
between the appropriate signal circuit terminal listed below and
ground. |
| |
• |
Left front low level audio
signal (+) - terminal 9 X3 |
| |
• |
Left front low level audio
signal (-) - terminal 1 X3 |
| |
• |
Right front low level audio
signal (+) - terminal 10 X3 |
| |
• |
Right front low level audio
signal (-) - terminal 2 X3 |
| |
• |
Left rear low level audio
signal (+) - terminal 11 X3 |
| |
• |
Left rear low level audio
signal (-) - terminal 3 X3 |
| |
• |
Right rear low level audio
signal (+) - terminal 12 X3 |
| |
• |
Right rear low level audio
signal (-) - terminal 4 X3 |
| ⇒ |
If less than the specified range, test the signal
circuit for a short to ground or an open/high resistance. If the
circuit tests normal, replace the A11 radio. |
| ⇒ |
If greater than the specified range, test the
signal circuit for a short to voltage. If the circuit tests normal,
replace the A11 radio. |
| 3. |
If all circuits test normal,
replace the T3 amplifier. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
