DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK CAN COMMUNICATION SYSTEM
CHECK WIRE HARNESS (DLC3 - ECM)
CHECK WIRE HARNESS (CG OF DLC3 - BODY GROUND)
CHECK WIRE HARNESS (TC OF ECM - BODY GROUND)
AIRBAG SYSTEM - Diagnosis Circuit
DESCRIPTION
DTC output mode is set by connecting terminals TC and CG of the DLC3.
DTCs are displayed by blinking the SRS warning light.
When each warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.
A DTC output mode signal is transmitted through BEAN and CAN to each ECU including the center airbag sensor assembly, except for the skid control ECU with actuator. Thus when all systems except the VSC system do not enter DTC output mode, there may be an ECM malfunction.
WIRING DIAGRAM
LHD:
RHD:
INSPECTION PROCEDURE
| 1.CHECK CAN COMMUNICATION SYSTEM |
Check if the CAN communication system DTC is output (for LHD (gasoline), for LHD (diesel), for RHD (gasoline), or for RHD (diesel)).
- Result:
| Condition | Proceed to |
| DTC is not output | A |
| DTC is output | B |
| | REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
|
| 2.CHECK WIRE HARNESS (DLC3 - ECM) |
Turn the engine switch off.
Disconnect the center airbag sensor assembly connector.
Measure the resistance according to the value(s) in the table below.
- Resistance:
for Gasoline| Tester connection | Condition | Specified condition |
| J21-13 (TC) - A6-3 (TC) | Always | Below 1 Ω |
for Diesel| Tester connection | Condition | Specified condition |
| J21-13 (TC) - A49-26 (TC) | Always | Below 1 Ω |
| | REPAIR OR REPLACE WIRE HARNESS (TC OF DLC3 - TC OF ECM) |
|
|
| 3.CHECK WIRE HARNESS (CG OF DLC3 - BODY GROUND) |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester connection | Condition | Specified condition |
| J21-4 (CG) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE WIRE HARNESS (CG OF DLC3 - BODY GROUND) |
|
|
| 4.CHECK WIRE HARNESS (TC OF ECM - BODY GROUND) |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
for Gasoline| Tester connection | Condition | Specified condition |
| A6-3 (TC) - Body ground | Always | 1 MΩ or higher |
for Diesel| Tester connection | Condition | Specified condition |
| A49-26 (TC) - Body ground | Always | 1 MΩ or higher |
| | REPAIR OR REPLACE WIRE HARNESS OR EACH ECU |
|
|
| OK | |
| |
| REPLACE CENTER AIRBAG SENSOR ASSEMBLY |
|
LEXUS IS250, IS220d / GSE20 ALE20
