Circuit Description
The SBM controls the courtesy lamps for theatre dimming. The outputs fade out in order to turn the lamps to the OFF position. If there is a short to voltage in CKT 156, a fault condition is present and a DTC will set.
Conditions for Setting the DTC
The SBM detects a short to voltage in CKT 156.
Action Taken When the DTC Sets
| • | Stores a DTC B2453 in the SBM memory |
| • | No driver warning message will be displayed for this DTC. |
Conditions for Clearing the DTC
| • | A short to voltage is no longer detected by the SBM in CKT 156. |
| • | A history DTC slears after 50 consecutive ignition cycles if the condition for the fault is no longer present. |
| • | Using the on-board diagnostic (clearing DTCs) feature. |
| • | Using a scan tool. |
Diagnostic Aids
The following conditions may cause an intermittent malfunction to occur:
| • | An intermittent short to voltage in CKT 156 |
| • | A short to voltage internal to the SBM |
If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while wiggling the wiring and the connectors. This can often cause the malfunction to appear.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Always perform the SBM Diagnostic System Check before attempting to diagnose a DTC B2453.
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This test inspects for a short to voltage in CKT 156 (WHT).
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Did you perform the Body Control Module (SBM) System Check? | -- | Go to Step 2 | ||
Does the test light illuminate? | -- | Go to Step 3 | Go to Step 4 | |
3 | Repair the short to battery positive voltage (B+) in CKT 156 (WHT). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Step 5 | -- |
4 |
Is the SBM replacement complete? | -- | Go to Step 5 | -- |
5 |
Are all of the DTCs cleared? | -- | -- |
