FOREWORD
- If there is any vehicle malfunction complaint lodged by a customer, perform malfunction diagnosis according to the troubleshooting procedure.
Troubleshooting Procedure Flowchart. Scheme 238
Scheme 238: Troubleshooting Procedure Flowchart
Scheme 239
Scheme 239: Action for non-repeatable malfunction
Scheme 240
- If the malfunction does not recur, verify the malfunction cause by performing the following actions: Verify that a DTC has been recorded in the memory. Based on the repair order form, attempt to drive the vehicle or perform tests to replicate the malfunction, record the data (such as CAN circuit voltage) at that time, and detect the malfunction cause. Refer to [Determining Open Circuit Location] based on the recorded DTC, shake the wiring harness or connector of the electrical component which is suspected to be the cause of the malfunction, and inspect for any changes in CAN system voltage or occurrence of any DTCs. (Scheme 239): Shaking Wiring Harness Or Connector Of Electrical Component Inspect the female terminals on the connector of the electric component which is suspected to be the cause of the malfunction for poor connection. (Scheme 240): Inspecting Female Terminals On Connector Of Electric Component
Outline
- The OBD (on-board diagnostic) system has the following functions: Malfunction detection function: Detects malfunctions in the air bag system and outputs DTCs (Diagnostic Trouble Codes). PID/data monitor function: Reads out specific input/output signals and the system status.
- DTCs can be read/cleared using the M-MDS. NOTE: Use the M-MDS to verify DTCs because the DTCs displayed by the air bag system warning light are reference information only.
NO.1 AIR BAG SYSTEM WARNING LIGHT DOES NOT ILLUMINATE
| 1 | Air bag system warning light does not illuminate. |
|---|
| DETECTION CONDITION | Air bag system warning light does not illuminate while the air bag system is performing initialization. |
| POSSIBLE CAUSE | Instrument cluster (circuit board) malfunction Short to ground circuit in wiring harness between instrument cluster and SAS control module Air bag system warning light (LED) malfunction Communication error between SAS control module and instrument cluster SAS control module malfunction |
NO.2 AIR BAG SYSTEM WARNING LIGHT ILLUMINATES CONSTANTLY
| 2 | Air bag system warning light illuminates constantly |
|---|
| DETECTION CONDITION | Air bag system warning light is illuminated constantly and remains illuminated after 6 s have elapsed. |
| POSSIBLE CAUSE | Weak battery SAS control module malfunction Instrument cluster (circuit board) malfunction No connection in SAS control module connector Poor contact in instrument cluster connector (24-pin) Open or short to power supply circuit in wiring harness between instrument cluster and SAS control module Poor contact at terminals 3X and/or 3C of SAS control module connector Poor contact in wiring harness between terminal 3X of SAS control module connector and ground Poor contact in wiring harness between battery and terminal 3C of SAS control module |
Instrument Cluster And SAS Control Module System Wiring Diagram. Scheme 241
Scheme 241: Instrument Cluster And SAS Control Module System Wiring Diagram
