U2003

DTC U2003 SPI Data - In High:

CIRCUIT DESCRIPTION
This code (both current and history) indicates the body control module (BCM) has sensed a short to voltage condition on the instrument cluster serial peripheral interface (SPI) data line to the BCM.

CONDITIONS FOR SETTING THE DTC
All of the following conditions:
^ Ignition 0 is active.
^ The serial data line from the IPC to the BCM is open or shorted to voltage for 5 seconds.

ACTION TAKEN WHEN THE DTC SETS
Stores DTC U2003 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
^ With the ignition switch in the ON position, test for voltage transitions on the SPI data line.
^ When the diagnostics direct you to take electrical measurements at the wiring harness junction blocks, refer to Diagrams.
^ If the DTC is a history DTC, the problem may be intermittent. Perform the above tests while wiggling the wiring and connectors. This may often cause the malfunction to appear.

TEST DESCRIPTION
The numbers below refer to the numbers on the diagnostic table.
2. This step determines if there is a short to the battery in CKT 1322 between the body control module (BCM) and the instrument cluster.
5. This step determines if there is a bad connection at the instrument cluster or the BCM.