Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using the diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Battery Positive Voltage Circuits | 1 | 1 | -- | -- |
Ignition Voltage Circuits | 1 | 1 | -- | -- |
Keyword 2000 Serial Data | 1 | 1 | 1 | -- |
Module Ground Circuits | -- | 1 | -- | -- |
1. Scan tool does not communicate with keyword 2000 device | ||||
Circuit/System Description
The climate control seat module (CCSM) communicates with a scan tool via the keyword 2000 serial data circuit. The keyword 2000 system is for diagnostics of the CCSM only. There is no communication between any other modules on the keyword 2000 serial data system.
Diagnostic Aids
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
Reference Information
Schematic Reference
Connector End View Reference
Heated/Cooled Seat Connector End Views
Description and Operation
Data Link Communications Description and Operation
Electrical Information Reference
Circuit/System Testing
- Ignition OFF, disconnect all of the harness connectors of the CCSM.
- Test for less than 1 ohm of resistance between the module ground circuit and ground.
- Ignition ON, verify that a test lamp illuminates between the battery positive voltage circuit and ground.
- Verify that a test lamp illuminates between the ignition voltage circuits and ground.
- Test for infinite resistance between the data link connector (DLC) keyword 2000 serial data circuit and ground.
- Test for less than 1 volt between the DLC keyword 2000 serial data circuit and ground.
- Test for less than 1 ohm of resistance in the keyword 2000 serial data circuit between the CCSM and the DLC.
- If all circuits test normal, replace CCSM.
| ⇒ | If greater than 1 ohm, repair the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, repair the circuit for a short to ground or an open/high resistance. If the circuit fuse is open, also test the positive voltage outputs of the module for a short to ground. If the circuits test normal, replace the CCSM. |
| ⇒ | If the test lamp does not illuminate, repair the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit fuse is open, also test the positive voltage outputs of the module for a short to ground. If the circuits test normal, replace the CCSM. |
| ⇒ | If less than the specified value, test the serial data circuit for a short to ground. |
| ⇒ | If greater than the specified range, test the serial data circuit for a short to voltage. |
| ⇒ | If greater than the specified range, test the serial data circuit for open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for CCSM replacement, setup, and programming
