Circuit Description
The data bus isolator will remain closed for 625 ms after entering the short loop poll sequence. If no PCM communication is received, the isolator will be opened. If the BCM receives PCM communication after the isolator has been opened the DTC is set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B0018-Auxiliary (Secondary and Tertiary) Serial Data Bus Fault
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Data Link Connector Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 | Inspect the auxiliary secondary and tertiary serial data circuits between the body control module and the modules on the serial data bus for and open or short to ground or voltage. Refer to Data Link Connector Schematics . Did you complete the repair? | Go to Step 3 | |
3 | Inspect the connectors of each module for loose or damaged terminals that could cause an intermittent condition. Did you complete the repair? | Go to Step 4 | |
4 | Replace the body control module. Refer to Body Control Module Replacement . Did you compete the repair? | -- | |
