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 instrument cluster connector.
- Use the DMM to measure the resistance between terminal 24 of the
instrument cluster connector and terminal 7 of the data link 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 circuits XM101 and/or XM500.
- Repair the open or the high resistance in circuits XM101 and/or
XM500.
Is the repair complete?
| --
|
Go to Step
23
| --
|
6
| Use the DMM to measure the resistance between terminal 7 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 7
|
Go to Step 14
|
7
|
- Disconnect the engine control module.
- Use the DMM to measure the resistance between terminal 7 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 engine control module
that is pulling the circuit to ground.
- Replace the engine control module. Refer to
Engine Control Module Replacement/Programming
in Engine Controls.
Is the replacement complete?
| --
|
Go to Step
23
| --
|
9
|
- Disconnect the driver seat adjuster memory module.
- Use the DMM to measure the resistance between terminal 7 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 11
|
Go to Step 10
|
10
|
- There is an internal failure within driver seat adjuster memory
module that is pulling the circuit to ground.
- Replace the driver seat adjuster memory module. Refer to
Memory Seat Control Module Replacement
in Seats.
Is the replacement complete?
| --
|
Go to Step
23
| --
|
11
|
- Disconnect the transmission control module.
- Use the DMM in order to measure the resistance between terminal
7 of the data link connector and a known good ground.
Is the resistance reading within the specified range?
| Less than 5 ohms
|
Go to Step 13
|
Go to Step 12
|
12
|
- There is an internal failure within the transmission control module
that is pulling the circuit to ground.
- Replace the transmission control module. Refer to
Transmission Control Module Replacement
in Automatic
Transmission.
Is the replacement complete?
| --
|
Go to Step
23
| --
|
13
| 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
23
| --
|
14
| Use the DMM to measure the voltage between terminal 7 of the data link
connector and a known good ground.
Is the measured voltage within the specified value?
| B+
|
Go to Step 15
|
Go to Step
22
|
15
|
- Disconnect the engine control module.
- Use the DMM to measure the voltage between terminal 7 of the data
link connector and a known good ground.
Is the measured voltage within the specified value?
| B+
|
Go to Step 16
|
Go to Step
17
|
16
|
- There is an internal failure within the engine control module
that is pulling the circuit to B+.
- Replace the engine control module. Refer to
Engine Control Module Replacement/Programming
in Engine Controls.
Is the replacement complete?
| --
|
Go to Step
23
| --
|
17
|
- Disconnect the driver seat adjuster memory module.
- Use the DMM to measure the voltage between terminal 7 of the data
link connector and a known good ground.
Is the measured voltage within the specified value?
| B+
|
Go to Step 18
|
Go to Step
19
|
18
|
- There is an internal failure within the driver seat adjuster memory
that is pulling the circuit to B+.
- Replace the driver seat adjust memory module. Refer to
Memory Seat Control Module Replacement
in Seats.
Is the replacement complete?
| --
|
Go to Step
23
| --
|
19
|
- Disconnect the transmission control module.
- Use the DMM to measure the voltage between terminal 7 of the data
link connector and a known good ground.
Is the measured voltage within the specified value?
| B+
|
Go to Step 20
|
Go to Step
21
|
20
| 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
23
| --
|
21
|
- There is an internal failure within the transmission control module
that is pulling the circuit to B+.
- Replace the transmission control module. Refer to
Transmission Control Module Replacement
in Automatic
Transmission.
Is the replacement complete?
| --
|
Go to Step
23
| --
|
22
|
- Use the DMM to check for proper voltage and ground circuits to
the instrument cluster.
- If the voltage and ground circuits are OK, replace instrument
cluster. Refer to
Instrument Cluster Gage Replacement
in Instrument Panel, Gauges and Console.
Is the replacement complete?
| --
|
Go to Step
23
| --
|
23
|
- Connect all connectors and components that were disconnected.
- Connect the scan tool.
- Establish communication with the instrument cluster.
Does the scan tool communicate with the instrument cluster?
| --
| System OK
|
Go to Step 1
|
