For 1990-2009 cars

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 |

1. The scan tool may be inoperative.
2. Verify that the scan tool operates properly.

Does the scan tool operate properly?

--

Go to Step 4

Go to Scan Tool Inoperative .

4 |

1. Disconnect the inflatable restraint sensing and diagnostic and seat belt pretensioner module connector.
2. Use the DMM to measure the resistance between terminal 12 of the inflatable restraint sensing and diagnostic and seat belt pretensioner 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 |

1. Locate an open or a high resistance in circuit XM10.
2. Repair the open or the high resistance in circuit XM10.

Is the repair complete?

--

Go to Step 23

--

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 |

1. Disconnect the electronic brake/traction control module.
2. 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 |

1. There is an internal failure within the electronic brake/traction control module that is pulling the circuit to ground.
2. 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 |

1. Disconnect the power steering control module.
2. 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 |

1. There is an internal failure within the power steering control module that is pulling the circuit to ground.
2. Replace the power steering control module. Refer to Power Steering Control Module Replacement in Variable Effort Sterring.

Is the replacement complete?

--

Go to Step 23

--

11 |

1. Disconnect the heater and A/C control.
2. 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 |

1. There is an internal failure within the heater and A/C control that is pulling the circuit to ground.
2. Replace the heater and A/C control. Refer to Control Assembly Replacement in HVAC Systems.

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 |

1. Disconnect the electric brake/traction control module.
2. 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 |

1. There is an internal failure within the electronic brake/traction control module that is pulling the circuit to B+.
2. 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 |

1. Disconnect the power steering control module.
2. 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 |

1. There is an internal failure within power steering control module that is pulling the circuit to B+.
2. 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 |

1. Disconnect the heater and A/C control.
2. 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 |

1. There is an internal failure within the heater and A/C control that is pulling the circuit to B+.
2. Replace the heater and A/C control. Refer to Control Assembly Replacement in HVAC Systems.

Is the replacement complete?

--

Go to Step 23

--

22 |

1. Use the DMM to check for proper voltage and ground circuits to the inflatable restraint sensing and diagnostic and seat belt pretensioner module.
2. If the voltage and ground circuits are OK, 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

--

23 |

1. Connect all connectors and components that were disconnected.
2. Connect the scan tool.
3. Establish communication with the inflatable restraint sensing and diagnostic and seat belt pretensioner module.

Does the scan tool communicate with the inflatable restraint sensing and diagnostic and seat belt pretensioner module?

--

System OK

Go to Step 1