Preliminary Checks Before Starting
Important:
- Perform
Diagnostic System Check - Body Rear End
before using the symptom tables in order to verify that all
of the following are true:
| • | There are no DTCs set. |
| • | The body control module (BCM) can communicate via the serial data link. |
- Review the system description and operation in order to familiarize
yourself with the system functions. Refer to
Luggage Compartment Description and Operation
.
Visual/Physical Inspection
Several of the symptom procedures ask for a careful visual/physical
check. This step is extremely important-it could lead to correcting a problem
without further checks and can save valuable time. These checks
include the following:
| • | Inspect for aftermarket devices which could affect the operation
of the Rear Compartment Release System. Refer to
Checking Aftermarket Accessories
in Wiring Systems. |
| • | Inspect the easily accessible or visible system components and
harness connectors for obvious damage or conditions which could cause the
symptom. |
Intermittents
Important:
| • | Check for proper installation of electrical components if an intermittent
condition exists. Inspect for aftermarket theft deterrent devices, lights
and cellular phones. Ensure that no aftermarket equipment is
connected to the class 2 circuit. If you can not locate an
intermittent condition, a cellular phone signal may cause the
condition. Faulty electrical connections or wiring may also
be the cause of intermittent conditions. Refer to
Testing for Intermittent Conditions and Poor Connections
in Wiring Systems. |
| • | The problem may or may not turn on the SERVICE VEHICLE SOON indicator
or store a DTC. Do not use the symptom tables to diagnose intermittent conditions.
The malfunction must be present in order to locate the problem. |
| • | Poor electrical connections or wiring cause most intermittent conditions.
Perform a careful visual/physical check for the following conditions: |
| - | Poor mating of the connector halves or a terminal not fully seated in
the connector body (backed out). |
| - | An improperly formed or damaged terminal. |
| - | Reform or replace connector terminals in the problem circuit in order
to insure proper contact tension. |
| - | Poor terminal to wire connection requires removing the terminal from
the connector body in order to perform the check. |
Road test the vehicle with a J 39200
digital multimeter (DMM) connected to the suspected circuit.
An abnormal voltage when the malfunction occurs is a good indication that
there is a malfunction in the circuit being monitored.
Use a Scan Tool
in
order to help detect intermittent conditions. The scan tool has several features
that can be used to locate an intermittent condition. The
snapshot feature can capture and store data parameters within
the scan tool when the malfunction occurs. This information
can then be reviewed in order to see what caused the malfunction.
Symptom List
Refer to
Trunk Release Inoperative
in order to diagnose a symptom that does not set a DTC.
