Aura L4-2.4L (2008)
15. Ignition OFF, remove the 3A fused jumper wire from the BCM terminal 55.
16. Ignition ON, test for less then 1 volt between the BCM serial data circuit terminal 55 and ground.
‹› If greater then the specified range, test the serial data circuit for a short to voltage.
17. Ignition OFF, test for less the 1 ohm between the BCM serial data circuit terminal 55 and ground.
‹› If greater than the specified range, test the circuit for a short to ground.
18. If all circuits test normal, replace the BCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests
and Procedures) after completing the repair.
*
Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming
*
GMLAN Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
Symptoms - Computer/Integrating Systems
Symptoms - Computer/Integrating Systems
Important: The following steps must be completed before using the symptom tables.
1. Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) before using the symptom tables in order to verify that all of the following are true:
*
There are no DTCs set.
*
The control modules can communicate via the serial data links.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to:
*
Body Control System Description and Operation (See: Body and Frame/Body Control Systems/Description and Operation)
*
Data Link Communications Description and Operation (See: Description and Operation)
Visual/Physical Inspection
*
Inspect for aftermarket devices which could affect the operation of the systems. Refer to Checking Aftermarket Accessories (See: Testing and
Inspection/Component Tests and General Diagnostics).
*
Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections (
See: Testing and Inspection/Component Tests and General Diagnostics).
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
*
Scan Tool Does Not Power Up (See: Scan Tool Does Not Power Up)
*
Scan Tool Does Not Communicate with High Speed GMLAN Device (See: Scan Tool Does Not Communicate with High Speed GMLAN Device
)
*
Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 1) (See: Scan Tool Does Not Communicate with Low Speed GMLAN
Device (Buss 1))Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 2) (See: Scan Tool Does Not Communicate with
Low Speed GMLAN Device (Buss 2))
Scan Tool Does Not Communicate with High Speed GMLAN Device
Scan Tool Does Not Communicate with High Speed GMLAN Device
Diagnostic Instructions
