Circuit Description
This circuit supplies the Passlock™ data to the body control module (BCM) from the Passlock™ sensor, CKT 1836.
Conditions for Setting the DTC
All of the following conditions must be met:
| • | The Passlock™ option is enabled. |
| • | Ignition 0 is active. |
| • | The Passlock™ code data CKT 1836 is shorted to voltage for 1 second. |
Action Taken When the DTC Sets
| • | The BCM enters the tamper mode. |
| • | The BCM stores the DTC B2958 in the BCM memory. |
| • | The vehicle will not start or the vehicle will start and the security indicator will illuminate. |
Conditions for Clearing the MIL/DTC
| • | The BCM goes to sleep and reinitializes with the fault cleared. |
| • | All of 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. |
| • | A Scan Tool is used. |
Diagnostic Aids
| • | When the diagnostics direct you to take electrical measurements at the wiring harness junction blocks, refer to Power Distribution Schematics for terminal assignments of the wiring harness junction blocks. |
| • | If the DTC is a history DTC, the problem may be intermittent. Perform the test shown while wiggling the wiring and connectors. This action often causes the malfunction to appear. |
Test Description
The numbers below refer to the numbers on the diagnostic table.
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 Theft Deterrent Diagnostic System Check performed? | -- | Go to Step 2 | |||||
Is the measured voltage within the specified range? | B+ | Go to Step 3 | Go to Step 4 | |||||
3 | Repair the short to B+ in CKT 1836 between the Passlock® connector terminal A and the BCM connector C2 terminal B6. Refer to Wiring Repairs in Wiring Systems Is the repair complete? | -- | Go to Step 12 | -- | ||||
4 | Use the J 39200 in order to measure the resistance in CKT 1836 between the BCM connector C2 terminal B6 and the Passlock® connector terminal A. Is the measured resistance within the specified range? | 0 - 2ohms | Go to Step 6 | Go to Step 5 | ||||
5 | Repair the open in CKT 1836 between the BCM connector C2 terminal B6 and the Passlock® connector terminal A. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 12 | -- | ||||
6 | Inspect for a poor connection at the BCM connector C2 terminal B6. Was a poor connection found? | -- | Go to Step 7 | Go to Step 8 | ||||
7 | Repair the poor connection at the BCM connector C2 terminal B6. Refer to Wiring Repairs in Wiring Systems Is the repair complete? | -- | Go to Step 12 | -- | ||||
8 | Inspect for a poor connection at the Passlock® sensor connector terminal A. Was a poor connection found? | -- | Go to Step 9 | Go to Step 10 | ||||
9 | Repair the poor connection at the Passlock® sensor connector terminal A. Refer to Wiring Repairs in Wiring Systems Is the repair complete? | -- | Go to Step 12 | -- | ||||
10 |
Is the repair complete? | -- | Go to Step 12 | Go to Step 11 | ||||
11 | Replace the BCM. Refer to the following procedures:
Is the repair complete? | -- | Go to Step 12 | -- | ||||
12 | Clear the DTCs from the memory. Are the DTCs cleared from the memory. | -- | -- | |||||
