DIAGNOSIS AND TESTING - HEATED SEAT MODULE
In order to obtain conclusive testing, the heated seat system and the Local Interface Network (LIN) data bus circuit must be checked. Any diagnosis of the heated seat system should begin with, the use of a scan tool and the appropriate diagnostic service information.
Refer to the appropriate wiring information for complete circuit schematic or connector pin-out information.
Note. Vehicles equipped with the heated seat option utilize a low voltage cut-off feature. This feature turns off power to the heated seat system anytime vehicle voltage is below 11.7v or above 15.5v. Be certain to check the vehicle electrical system for proper voltage anytime the power seat system appears inoperative.
Before any testing of the heated seat system is attempted, the battery should be fully-charged.
Scheme 7
| CAUTION | The Heated Seat Module mounting tab can be damaged during module removal and installation. Use care to properly align tab to prevent binding that could result in tab breakage. |
- Position the driver front seat to the full rearward position.
- Disconnect and isolate the battery negative cable.
- Disconnect the wire harness connector (4) from the heated seat module (3).
- Unsnap the heated seat module retaining tab (2) from the seat pan (1).
- Remove the heated seat module (3) from the vehicle.
OBTAINING DTC'S USING SCAN TOOL
- Connect the scan tool to the data link (diagnostic) connector. This connector is located in the passenger compartment; at the lower edge of instrument panel; near the steering column.
- Turn the ignition switch on and access the "Read Fault" screen.
- Record all the DTC's and "freeze frame" information shown on the scan tool.
- To erase DTC's, use the "Erase Trouble Code" data screen on the scan tool. Do not erase any DTC's until problems have been investigated and repairs have been performed.
DIAGNOSIS AND TESTING - SCM
| WARNING | To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment. |
The hard wired circuits between components related to the Steering Control Module (SCM) may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.
However, conventional diagnostic methods will not prove conclusive in the diagnosis of the SCM or the electronic controls or communication between modules and other devices that provide some features of the SCM. The most reliable, efficient, and accurate means to diagnose the SCM or the electronic controls and communication related to SCM operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.