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 Power and Grounding Component Views in Wiring Systems. |
| • | 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.
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This step determines if there is a short to the battery in CKT 1322 between the body control module (BCM) and the instrument cluster.
-
This step determines if there is a bad connection at the instrument cluster or the BCM.
Step | Action | Value(s) | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
|
Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open. | ||||||||
1 | Was the BCM Diagnostic System Check performed? | -- | Go to Step 2 | |||||
Disconnect the BCM connector C2 terminal B7 CKT 1322. Use the J 39200 in order to measure the voltage in CKT 1322 between the BCM harness connector C2 terminal B7 and ground. Does the measured voltage equal the specified value? | Greater than 0 V | Go to Step 3 | Go to Step 5 | |||||
3 | Use the J 39200 in order to measure the resistance in CKT 1322 Is the measured resistance within the specified range? | 0-2 ohms | Go to Step 5 | Go to Step 13 | ||||
4 | Repair the short to voltage in the CKT 1322 between the BCM connector C2 terminal B7 and the instrument cluster connector A2. Refer to Wiring Repairs in Wiring Systems. Is the CKT repair complete? | -- | Go to Step 12 | -- | ||||
Is the SPI data input LOW? | -- | Go to Step 9 | Go to Step 6 | |||||
6 | Inspect for a poor connection at the connector C2 terminal B7 CKT 1322. Is a poor connection found? | -- | Go to Step 7 | Go to Step 8 | ||||
7 | Repair the poor connection in CKT 1322. Refer to Wiring Repairs in Wiring Systems. Is the CKT repair complete? | -- | Go to Step 12 | -- | ||||
8 | Replace the BCM. Refer to the following procedures:
Is the repair complete? | -- | Go to Step 12 | -- | ||||
9 | Inspect for a poor connection at the instrument cluster connector terminal A2 CKT 1322. Is a poor connection found? | -- | Go to Step 10 | Go to Step 11 | ||||
10 | Repair the poor connection at the instrument cluster connector terminal A2. Refer to Wiring Repairs in Wiring Systems. Is the CKT repair complete? | -- | Go to Step 11 | -- | ||||
11 | Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Step 12 | -- | ||||
12 | Clear the DTCs from the memory. Are the DTCs cleared from the memory? | -- | -- | |||||
13 | Repair the open in CKT 1322. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |||||
