Toyota Corolla Cross: LIN Communication Circuit

DESCRIPTION

• *: The front occupant classification sensor LH and rear occupant classification sensor LH are built into the front seat cushion spring sub-assembly RH.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.

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HINT:

• When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

  Click here

• If it is difficult to perform troubleshooting (wire harness inspection), remove the front passenger seat installation bolts to see under the seat cushion.
• In the above case, lift and hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long period of time may cause seat rail deformation.

PROCEDURE

(a) Check for error codes.

B

GO TO STEP 8

C

GO TO STEP 11

A

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check that the connectors are properly connected to the airbag ECU assembly, front occupant classification sensor LH and rear occupant classification sensor LH.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY

OK

(a) Disconnect the connectors from the airbag ECU assembly, front occupant classification sensor LH and rear occupant classification sensor LH.

*1 Front Occupant Classification Sensor LH *2 Rear Occupant Classification Sensor LH *3 Airbag ECU Assembly *4 Wire Harness

(b) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals of the connectors are not deformed or damaged.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition O17-24 (SVC) - j167-1 (SVC) Always Below 1 Ω O17-32 (SIG) - j167-2 (SIG) Always Below 1 Ω O17-31 (SGD) - j16-3 (SGD) Always Below 1 Ω O17-24 (SVC) - j17-1 (SVC) Always Below 1 Ω O17-32 (SIG) - j17-2 (SIG) Always Below 1 Ω O17-31 (SGD) - j17-3 (SGD) Always Below 1 Ω

*1 Front Occupant Classification Sensor LH *2 Rear Occupant Classification Sensor LH *3 Airbag ECU Assembly *4 Wire Harness *a Front view of wire harness connector (to Airbag ECU Assembly) *b Front view of wire harness connector (to Front Occupant Classification Sensor LH) *c Front view of wire harness connector (to Rear Occupant Classification Sensor LH)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition O17-32 (SIG) - Other terminals Always 1 MΩ or higher j16-2 (SIG) - Other terminals Always 1 MΩ or higher j17-2 (SIG) - Other terminals Always 1 MΩ or higher

*1 Front Occupant Classification Sensor LH *2 Rear Occupant Classification Sensor LH *3 Airbag ECU Assembly *4 Wire Harness *a Front view of wire harness connector (to Airbag ECU Assembly) *b Front view of wire harness connector (to Front Occupant Classification Sensor LH) *c Front view of wire harness connector (to Rear Occupant Classification Sensor LH)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition O17-32 (SIG) - Body ground Always 1 MΩ or higher j16-2 (SIG) - Body ground Always 1 MΩ or higher j17-2 (SIG) - Body ground Always 1 MΩ or higher

*1 Front Occupant Classification Sensor LH *2 Rear Occupant Classification Sensor LH *3 Airbag ECU Assembly *4 Wire Harness *a Front view of wire harness connector (to Airbag ECU Assembly) *b Front view of wire harness connector (to Front Occupant Classification Sensor LH) *c Front view of wire harness connector (to Rear Occupant Classification Sensor LH)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Connect the cable to the negative (-) auxiliary battery terminal.

*1 Front Occupant Classification Sensor LH *2 Rear Occupant Classification Sensor LH *3 Airbag ECU Assembly *4 Wire Harness *a Front view of wire harness connector (to Airbag ECU Assembly) *b Front view of wire harness connector (to Front Occupant Classification Sensor LH) *c Front view of wire harness connector (to Rear Occupant Classification Sensor LH)

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

(d) Turn the ignition switch off.

(e) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

OK

REPLACE AIRBAG ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check that the connectors are properly connected to the airbag ECU assembly and front occupant classification sensor LH.

OK:

The connectors are properly connected.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Disconnect the connectors from the airbag ECU assembly and front occupant classification sensor LH.

*1 Front Occupant Classification Sensor LH *2 Airbag ECU Assembly *3 Wire Harness

(b) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals of the connectors are not deformed or damaged.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition O17-24 (SVC) - j16-1 (SVC) Always Below 1 Ω O17-32 (SIG) - j16-2 (SIG) Always Below 1 Ω O17-31 (SGD) - j16-3 (SGD) Always Below 1 Ω

*1 Front Occupant Classification Sensor LH *2 Airbag ECU Assembly *3 Wire Harness *a Front view of wire harness connector (to Airbag ECU Assembly) *b Front view of wire harness connector (to Front Occupant Classification Sensor LH)

OK

REPLACE FRONT SEAT CUSHION SPRING SUB-ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check that the connectors are properly connected to the airbag ECU assembly and rear occupant classification sensor LH.

OK:

The connectors are properly connected.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Disconnect the connectors from the airbag ECU assembly and rear occupant classification sensor LH.

*1 Rear Occupant Classification Sensor LH *2 Airbag ECU Assembly *3 Wire Harness

(b) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals of the connectors are not deformed or damaged.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition O17-24 (SVC) - j17-1 (SVC) Always Below 1 Ω O17-32 (SIG) - j17-2 (SIG) Always Below 1 Ω O17-31 (SGD) - j17-3 (SGD) Always Below 1 Ω

*1 Rear Occupant Classification Sensor LH *2 Airbag ECU Assembly *3 Wire Harness *a Front view of wire harness connector (to Airbag ECU Assembly) *b Front view of wire harness connector (to Rear Occupant Classification Sensor LH)

OK

REPLACE FRONT SEAT CUSHION SPRING SUB-ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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