Step
| Action
| Value(s)
| Yes
| No
|
1
| Was the Data Link Connector System Check performed?
| --
|
Go to Step 2
| Go to
Data Link Communications System Check
.
|
2
| Attempt to establish communication
with the same system, same year, on a different vehicle.
Can communication be established?
| --
|
Go to Step
4
|
Go to Step 3
|
3
|
- The scan tool may be inoperative.
- Verify that the scan tool operates properly.
Does the scan tool operate properly?
| --
|
Go to Step 4
| Go to
Scan Tool Inoperative
.
|
4
|
- Disconnect the theft deterrent module connector.
- Use the DMM to measure the resistance between terminal 3 of the
data link connector and terminal 8 of the theft deterrent module connector.
Is the measured resistance within the specified value?
| Less than 5 ohms
|
Go to Step 6
|
Go to Step 5
|
5
|
- Locate an open or a high resistance in circuit XM15.
- Repair the open or the high resistance in circuit XM15
Is the repair complete?
| --
|
Go to Step
15
| --
|
6
| Use the DMM to measure the resistance between terminal 3 of the data
link connector and a known good ground.
Is the measure resistance within the specified value?
| Less than 5 ohms
|
Go to Step 7
|
Go to Step 10
|
7
|
- Disconnect the sun roof actuator connector.
- Use the DMM to measure the resistance between terminal 3 of the
data link connector and a known good ground.
Is the measured resistance within the specified value?
| Less than 5 ohms
|
Go to Step 9
|
Go to Step 8
|
8
|
- There is an internal failure within the sun roof actuator that
is pulling the circuit to ground.
- Replace the sun roof actuator. Refer to
Sunroof Actuator Replacement
in Roof.
Is the replacement complete?
| --
|
Go to Step
15
| --
|
9
| If all of the modules are disconnected and there is still a short to
ground, locate and repair a short to ground in the circuits.
Is the repair complete?
| --
|
Go to Step
15
| --
|
10
| Use the DMM to measure the voltage between terminal 3 of the data link
connector and a known good ground.
Is the measure voltage within the specified value?
| B+
|
Go to Step 11
|
Go to Step
14
|
11
|
- Disconnect the sun roof actuator connector.
- Use the DMM to measure the voltage between terminal 3 of the data
link connector and a good ground.
Is the measured voltage within the specified value?
| B+
|
Go to Step 13
|
Go to Step
12
|
12
|
- There is an internal failure within the sun roof actuator that
is pulling the circuit to B+.
- Replace the sun roof actuator. Refer to
Sunroof Actuator Replacement
in Roof.
Is the replacement complete?
| --
|
Go to Step
15
| --
|
13
| If all of the modules are disconnected and there is still a short to
B+, locate and repair a short to B+ in the circuits.
Is the repair complete?
| --
|
Go to Step
15
| --
|
14
|
- Use the DMM to check for proper voltage and ground circuits to
the theft deterrent module.
- If the voltage and ground circuits are OK, replace the theft deterrent
module. Refer to
Theft Deterrent Module Replacement
in Theft Deterrent.
Is the replacement complete?
| --
|
Go to Step
15
| --
|
15
|
- Connect all connectors and components that were disconnected.
- Connect the scan tool.
- Establish communication with the theft deterrent module.
Does the scan tool communicate with the theft deterrent module?
| --
| System OK
|
Go to Step 1
|
