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 electronic brake/traction control module connector.
- Use the DMM to measure the resistance between terminal 11 of the
electronic brake/traction control module connector and terminal 12 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 XM400, XM300 and/or
XM218.
- Repair the open or the high resistance in circuits XM400, XM300
and/or XM218.
Is the repair complete?
| --
|
Go to Step 7
| --
|
6
| Use
the DMM to measure the resistance between terminal 12 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 heater and A/C control.
- Use the DMM to measure the resistance between terminal 12 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 heater and A/C control
that is pulling the circuit to ground.
- Replace the heater and A/C control. Refer to
Control Assembly Replacement
in HVAC Systems.
Is the replacement complete?
| --
|
Go to Step 23
| --
|
9
|
- Disconnect the power steering control module.
- Use the DMM to measure the resistance between terminal 12 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 the power steering control
module that is pulling the circuit to ground.
- Replace the power steering control module. Refer to
Power Steering Control Module Replacement
in Variable
Effort Steering.
Is the replacement complete?
| --
|
Go to Step 23
| --
|
11
|
- Disconnect the inflatable restraint sensing and diagnostic and
seat belt pretensioner module.
- Use the DMM to measure the resistance between terminal 12 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
13
|
Go to Step
12
|
12
|
- There is an internal failure within the inflatable restraint sensing
and diagnostic and seat belt pretensioner module that is pulling the circuit
to ground.
- Replace the inflatable restraint sensing and diagnostic and seat
belt pretensioner module. Refer to
Inflatable Restraint Sensing and Diagnostic and Seat Belt Pretensioner Module Replacement
in SIR.
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 12 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 heater and A/C control.
- Use the DMM to measure the voltage between terminal 12 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 heater and A/C control
that is pulling the circuit B+.
- Replace the heater and A/C control. Refer to
Control Assembly Replacement
in HVAC Systems.
Is the replacement complete?
| --
|
Go to Step 23
| --
|
17
|
- Disconnect the power steering control module.
- Use the DMM to measure the voltage between terminal 12 of the
data link connector and 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 power steering control
module that is pulling the circuit to B+.
- Replace the power steering control module. Refer to
Power Steering Control Module Replacement
in Variable
Effort Steering.
Is the replacement complete?
| --
|
Go to Step 23
| --
|
19
|
- Disconnect the inflatable restraint sensing and diagnostic and
seat belt pretensioner module.
- Use the DMM to measure the voltage between terminal 12 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 inflatable restraint sensing
and diagnostic and seat belt pretensioner module that is pulling the circuit
to B+.
- Replace the inflatable restraint sensing and diagnostic and seat
belt pretensioner module. Refer to Refer to
Inflatable Restraint Sensing and Diagnostic and Seat Belt Pretensioner Module Replacement
in SIR.
Is the replacement complete?
| --
|
Go to Step 23
| --
|
22
|
- Use the DMM to check for proper voltage and ground circuits to
the electronic brake/traction control module.
- If the voltage and ground circuits are OK, replace the electronic
brake/traction control module. Refer to
Electronic Brake and Traction Control Module Replacement
in Antilock Brakes.
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 electronic brake/traction control
module.
Does the scan tool communicate with the electronic brake/traction control
module?
| --
| System OK
|
Go to Step 1
|
