For 1990-2009 cars
Data Link Communications Components
Data Link Connector Schematics

### Circuit Description

This is code (both current and history) indicates the body control module (BCM) has sensed a loss of serial peripheral interface (SPI) data from the instrument cluster.

### Conditions for Setting the DTC

All of the following conditions must be met:

• | Ignition 0 is active.

• | The serial data transmitted from the instrument panel cluster (IPC) to the BCM is incorrect for 12 seconds.

### Action Taken When the DTC Sets

Stores DTC U2001 in the BCM memory

### Conditions for Clearing the DTC

• | The BCM goes to sleep and reinitializes with the malfunction cleared.

• | All the BCM history codes will be cleared after 100 ignition cycles (from OFF to ON) with no current codes active during the 100 ignition cycles.

• | Use the scan tool.

### Diagnostic Aids

• | When the diagnostics direct you to take electrical measurements at the wiring harness junction blocks, refer to Power Distribution for terminal assignments of the wiring harness junction blocks.

• | If the DTC is a history DTC, the problem may be intermittent. Perform the above tests while wiggling the wiring and connectors. This often causes the malfunction to appear.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the body control module (BCM) diagnostic system check performed? | -- | Go to Step 2 | Go to Body Control Module System Check
2 | Diagnose and repair DTC U2002 through DTC 2007. Is the repair complete? | -- | Go to Step 5 | Go to Step 3
3 | Use the scan tool in order to check if DTC U2001 is current without DTC U2002 through DTC U2007 as current codes. Is U2001 a current DTC without DTC U2002 through 2007 as current codes? | -- | Go to Step 4 | Go to Step 2
4 | Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Step 5 | --
5 | Clear the DTCs from the memory. Are the DTCs cleared from the memory? | -- | Go to Body Control Module System Check | --