INSPECTION
Measure the battery voltage and check electrolyte.
Standard voltage
12 V
Specific gravity
1.260 or more
Fluid level
Between the upper level and lower level
TROUBLE SYMPTOM
Communication is impossible between the airbag control module and the occupant detection control module.
Perform the diagnosis from Step 2 in "DTC B1650 OCCUPANT CLASSIFICATION SYSTEM MALFUNCTION". < Refer to DTC B1650 OCCUPANT CLASSIFICATION SYSTEM MALFUNCTION , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
Turn the ignition switch to ON, and confirm that the airbag warning light remains on for approx. 6 seconds and then goes off afterwards.
Scheme 185
Scheme 186
DTC DETECTING CONDITION
- Occupant detection sensor is faulty.
- Occupant detection control module is faulty.
- Occupant detection harness is faulty.
- Rear airbag harness is faulty. CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". < Refer to «CAUTION»(ref-560395-S17771233042013061300000) , General Description. >
DIAGNOSTIC PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read the DTC of the occupant detection system. | Is any of DTC B1760, B1761, B1771 and B1795 detected? | Perform the diagnosis according to DTC. | Go to step 2 . |
| 2 CHECK POOR CONTACT OF CONNECTORS. Check for poor contact of the connectors between the occupant detection control module and airbag control module. | Is there poor contact? | Reconnect the connector. If defective is not improved, replace the airbag rear harness along with the body harness or the occupant detection harness (seat harness). | Go to step 3 . |
| 3 CHECK AIRBAG REAR HARNESS. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more. Disconnect the connectors (AB59) and (AB53) under the passenger's seat. Disconnect the connectors (AB6, AB17, AB18) from the airbag control module, and connect the connector (1AG) in the test harness AG to connectors (AB6, AB17, AB18). NOTE: Except for XV models, connect test harness AH between the connectors (AB6, AB17, AB18) and (1AG). Connect the connector (1AP) in the test harness AP to the connector (AB53). Measure the resistance between connector (5AG) in the test harness AG and connector (2AP) in the test harness AP. Connector & terminal XV model (6AG) No. 9 - (2AP) No. 2: (6AG) No. 11 - (2AP) No. 1: Except for XV model (5AG) No. 5 - (2AP) No. 1: (5AG) No. 16 - (2AP) No. 2 | Is the resistance less than 10 ohms? | Go to step 4 . | Replace the airbag rear harness along with body harness. |
| 4 CHECK AIRBAG REAR HARNESS. Measure the resistance between connector (5AG) in the test harness AG and chassis ground. Connector & terminal XV model (6AG) No. 9 - Chassis ground: (6AG) No. 11 - Chassis ground: (6AG) No. 9 - (6AG) No. 11: Except for XV model (5AG) No. 5 - Chassis ground: (5AG) No. 16 - Chassis ground: (5AG) No. 5 - (5AG) No. 16 | Is the resistance 1 Mohms or more? | Go to step 5 . | Replace the airbag rear harness along with body harness. |
| 5 CHECK OCCUPANT DETECTION HARNESS. Turn the ignition switch to ON. Measure the voltage between connector (2AB) in the test harness AB and chassis ground. Connector & terminal (2AP) No. 3 (+) - Chassis ground (-) | Is the voltage 10 V or more? | Replace the occupant detection harness (seat harness). If defective is not improved, replace the occupant detection system (seat cushion & frame assembly), and then the airbag control module in this order. < Refer to PASSENGER'S SEAT , DISASSEMBLY, Front Seat. > | Check the battery voltage and fuse. If there is no fault, replace the airbag rear harness together with body harness. |
| NOTE |
|---|
| Except for XV models, connect test harness AH between the connectors (AB6, AB17, AB18) and (1AG). |
DIAGNOSTIC PROCEDURE
- Passenger's buckle switch circuit is open, shorted or shorted to ground.
- Seat harness circuit is open, shorted or shorted to ground.
- Occupant detection control module is faulty.
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read the DTC of the occupant detection system. | Is any of DTC B1760, B1761, B1771 and B1795 detected? | Perform the diagnosis according to DTC. | Go to step 2 . |
| 2 CHECK POOR CONTACT OF CONNECTORS. Check for poor contact of the connectors between the occupant detection control module and buckle switch. | Is there poor contact? | Reconnect the connector. If the fault is not fixed, replace the airbag harness. | Go to step 3 . |
| 3 CHECK BUCKLE SWITCH. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds. Disconnect the buckle switch connector (AB60). Connect the test harness AE and test harness connector Y to buckle switch connector (AB60). Connect the battery ground terminal and turn the ignition switch to ON. | Does the airbag warning light illuminate for 6 seconds and go off? | Replace the buckle switch. < Refer to SEAT BELT OUTER - FRONT , REMOVAL, Front Seat Belt. > | Check the seat harness, and if any fault is found, replace the seat harness. If the fault is not fixed, replace the occupant detection system. < Refer to PASSENGER'S SEAT , DISASSEMBLY, Front Seat. > |
DIAGNOSTIC PROCEDURE
- Occupant detection sensor circuit is open, shorted between terminals, shorted to power supply or shorted to ground.
- Seat heater circuit is open.
- Occupant detection control module is faulty.
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK POOR CONTACT OF CONNECTORS. Check for poor contact of connectors between the occupant detection control module and the occupant detection sensor. | Is there poor contact of connector? | Reconnect the connector. If the fault is not fixed, replace the occupant detection harness or replace the occupant detection system (passenger's & frame assembly). | Replace the occupant detection system (passenger's & frame assembly). < Refer to PASSENGER'S SEAT , DISASSEMBLY, Front Seat. > |
DIAGNOSTIC PROCEDURE
- Occupant detection sensor is spattered with fluid.
- Occupant detection sensor is faulty.
- Occupant detection control module is faulty.
| Step | Check | Yes | No |
|---|---|---|---|
| 1 DRY THE SEAT. Open the vehicle windows in a well-ventilated place indoors and dry the seat for 24 hours. Read the DTC of the occupant detection system. | Is DTC B1761 detected? | Replace the occupant detection system (passenger's & frame assembly). < Refer to PASSENGER'S SEAT , DISASSEMBLY, Front Seat. > | Clear the memory. |
DIAGNOSTIC PROCEDURE
- Passenger's seat buckle switch is faulty.
- Passenger's buckle switch circuit is open, shorted or shorted to ground.
- Occupant detection system is faulty.
- Occupant detection harness is faulty.
Perform the diagnosis from Step 2 in "DTC B1655 FRONT BUCKLE SWITCH RH FAILURE". < Refer to DTC B1655 FRONT BUCKLE SWITCH RH FAILURE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
Occupant detection control module is faulty.
When "DTC B1795 ECU INTERNAL CIRCUIT FAULT" is displayed, the occupant detection control module is faulty. Replace the occupant detection system (passenger's & frame assembly). < Refer to PASSENGER'S SEAT , DISASSEMBLY, Front Seat. >