Circuit Description
This code (both current and history) indicates the body control module (BCM) has sensed a short to ground condition on the instrument cluster serial peripheral interface (SPI) data line to the BCM.
Conditions for Setting the DTC
The following conditions must be met:
| • | Ignition 0 is active. |
| • | The serial data line from the IPC to the BCM is shorted to ground for 5 seconds. |
Action Taken When the DTC Sets
Stores DTC U2002 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 RUN) with no current codes active during the 100 ignition cycles. |
| • | Use the scan tool. |
Diagnostic Aids
| • | Diagnose DTC U2006 and DTC U2007 before diagnosing this DTC. |
| • | 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. |
Test Description
The numbers below refer to the numbers on the diagnostic table.
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This step determines if the BCM is delivering power to the instrument cluster.
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This step determines if the body control module (BCM) is reading the serial peripheral interface data input high.
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This step determines if there is an open in CKT 1322 between the BCM and the instrument cluster.
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This step determines if there is a short to ground in CKT 1322 between the BCM and the instrument cluster.
Step | Action | Value(s) | Yes | No | ||
|---|---|---|---|---|---|---|
1 | Was the body control module (BCM) diagnostic system check performed? | -- | Go to Step 2 | |||
Does the voltage equal the specified value? | Battery Voltage | Go to Step 3 | Go to Step 7 | |||
Use the scan tool in order to verify that the SPI data input is HIGH. Is the SPI data input HIGH? | -- | Go to Step 4 | Go to Step 11 | |||
4 | Inspect for a poor connection at the instrument cluster connector terminal A2 CKT 1322. Is a poor connection found? | -- | Go to Step 5 | Go to Step 6 | ||
5 | Repair the poor connection at the instrument cluster connector. Refer to Wiring Repairs . Is the repair complete? | -- | Go to Step 14 | -- | ||
6 | Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panels, Gauges and Console. Is the repair complete? | -- | Go to Step 14 | -- | ||
Is the measured resistance within the specified range? | 0-2 ohms | Go to Step 8 | Go to Step 9 | |||
Use the J 39200 DMM in order to measure the resistance in CKT 1322 between the connector C2 terminal B7 and ground. Does the measured resistance equal the specified value? | 0L (Infinite) | Go to Step 11 | Go to Step 10 | |||
9 | Repair the open in CKT 1322 between the instrument cluster connector A2 and the connector C2 terminal B7. Refer to Wiring Repairs . Is the repair complete? | -- | Go to Step 14 | -- | ||
10 | Repair the short to ground in CKT 1322 between the instrument cluster connector A2 and the connector C2 terminal B7. Refer to Wiring Repairs . Is the repair complete? | -- | Go to Step 14 | -- | ||
11 | Inspect for a poor connection at the connector C2 terminal B7 CKT 1322. Is a poor connection found? | -- | Go to Step 12 | Go to Step 13 | ||
12 | Repair the poor connection at the BCM connector C2 terminal B7 CKT 1322. Refer to Wiring Repairs . Is the CKT repair complete? | -- | Go to Step 14 | -- | ||
13 | Replace the BCM. Refer to the following procedures:
Is the repair complete? | -- | Go to Step 14 | -- | ||
14 | Clear the DTCs from the memory. Are the DTCs cleared from the memory? | -- | Go to Body Control Module System Check in Body Control System | -- |
