For 1990-2009 cars

### Circuit Description

The Integrated Radio Controller (IRC) and the CD changer communicate on the E&C data line. The IRC sets DTC B1760 when it detects a loss of E&C communications with the CD Changer. If the CD changer is not heard from, the IRC initiates communications with the CD changer to determine its integrity.

### Conditions for Setting the DTC

• | This algorithm shall execute when the radio transitions from the OFF to the ON mode.

• | DTC B1760 will set if the IRC detects a loss of E&C communication between the radio and the CD changer.

### Action Taken When the DTC Sets

• | DTC B1760 is stored in the IRC memory.

• | No driver warning message will be displayed for this DTC.

### Conditions for Clearing the DTC

DTC B1760 will clear when the ignition switch is cycled.

### Diagnostic Aids

If this DTC is intermittent, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

### Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

1. This step tests for an open in the E&C serial data circuit.

2. This step replaces the CD changer after verifying that the serial data circuit is not open.

#### DTC B1760 CD Changer Not Responding

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Radio/Audio System Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Radio/Audio System
2 |

1. Remove the radio.
2. Disconnect the radio connector.
3. Disconnect the CD Changer connector.
4. Test the E&C serial data circuit for an open.

Did you find and correct the condition?

--

Go to Step 3

Go to Step 4

3 |

1. Connect all connectors and components that were disconnected.
2. Verify that the radio and the CD changer operate properly.

Does the radio and the CD changer operate properly?

--

System OK

--

4 | Replace the CD changer. Is the replacement complete? | -- | Go to Step 3 | --