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 heater and A/C control connector C1.
- Use the DMM to measure the resistance between terminal 17 of the
heater and A/C control connector C1 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 and/or XM110.
- Repair the open or the high resistance in circuits XM400 and/or
XM110.
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 electronic brake/traction 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 9
|
Go to Step 8
|
8
|
- There is an internal failure within the electronic brake/traction
control module that is pulling the circuit to ground.
- 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
| --
|
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 electronic brake/traction control 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 16
|
Go to Step 17
|
16
|
- There is an internal failure within the electronic brake/traction
control module that is pulling the circuit to B+.
- 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
| --
|
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
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 heater and A/C control.
- If the voltage and ground circuits are OK, replace the heater
and A/C control. Refer to
Control Assembly Replacement
in HVAC Systems.
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 heater and A/C control.
Does the scan tool communicate with the heater and A/C control?
| --
| System OK
|
Go to Step 1
|
