Circuit Description
The BCM receives a ground signal from the Electronic Traction Control Switch through circuit 1571. The BCM receives the ground signal when the ignition is RUN and the driver toggles the enable/disable mode of the traction control system from an inactive to an active state. At this point the BCM sends out a class 2 message to the EBTCM. The BCM will not sent this message again until the traction control switch input has returned to an inactive state and transitions back to an active state.
Conditions for Setting the DTC
The BCM detects a short to ground in circuit 1571 for over 5 minutes.
Action Taken When the DTC Sets
The BCM stores DTC B2747 in memory.
Conditions for Clearing the DTC
| • | The BCM detects a short to ground in circuit 1571. |
| • | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | Using a scan tool. |
Diagnostic Aids
| • | The following conditions may cause an intermittent malfunction to occur: |
| - | An intermittent short to ground in circuit 1571. |
| - | The BCM is shorted to ground internally. |
| • | If the DTC is a history DTC, the problem may be intermittent. Try performing the tests shown while moving wiring and connectors, this can often cause the malfunction to reappear. |
| • | DTC P1626 will set in the Powertrain Control Module (PCM) when the ignition switch is on with the Body Control module (BCM) disconnected. When BCM diagnostics and repairs are completed, refer to Powertrain On Board Diagnostic (OBD) System Check |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
This step checks for ground in circuit 1571.
-
The step determines whether the short to ground is in circuit 1571 or the Electronic Traction Control Switch.
-
This step determines whether the malfunction is intermittent or the BCM is faulty.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the BCM Diagnostic System Check performed? | -- | Go to Step 2 | |
Is the test light on? | -- | Go to Step 3 | Go to Step 4 | |
Is the test light on? | -- | Go to Step 5 | Go to Step 6 | |
Does BCM DTC B2747 reset as a current DTC? | -- | Go to Step 7 | Go to Step 8 | |
5 | Repair short to ground in circuit 1571 between the BCM connector C2 terminal A11 and electronic traction control switch connector terminal D. Is the repair complete? | -- | Go to Step 9 | -- |
6 | Replace the Electronic Traction Control Switch. Is the repair complete? | -- | Go to Step 9 | -- |
7 |
Is the repair complete? | -- | Go to Step 9 | -- |
8 | The malfunction is not present. Refer to Diagnostic Aids for additional information regarding DTC. Is the repair complete? | -- | Go to Step 9 | -- |
9 |
Are there current BCM DTCs set? | -- | System OK |
