For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category

### DTC Descriptor

DTC B101D 00: ECU Hardware Performance, EEPROM Failure

### Circuit/System Description

The secondary information centre (SIC) interface module uses GMLAN to communicate between the drivers information centre (DIC), infotainment unit, engine control module (ECM) and the body control module (BCM). DTC B101D indicates that the SIC has an internal fault and is not affected by any external circuits.

### Conditions for Running the DTC

Ignition voltage is between 9-16 volts

### Conditions for Setting the DTC

When the SIC has recognised an internal fault.

### Action Taken When the DTC Sets

This code will set as current when the SIC recognises an internal fault or fails to communicate with the BCM.

### Conditions for Clearing the DTC

• | The condition for setting the DTC is no longer present.

• | The DTC can be cleared using a scan tool.

### Reference Information

#### Schematic Reference

Instrument Cluster Schematics

#### Connector End View Reference

Component Connector End Views

#### Scan Tool Reference

Control Module References

### Circuit/System Testing

1. Ignition OFF, wait for 30 seconds.
2. Ignition ON, using the scan tool, select the DTC display function.

⇒ | If DTC B101D is set to current, clear all DTCs.

⇒ | Verify that no other DTCs are set.

3. Ignition ON, using the scan tool view the Current DTCs.

⇒ | If DTC B101D is set to current replace the SIC interface Module.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Instrument Panel Upper Trim Pad Replacement

• | Control Module References for SIC replacement, setup and programming.