Toyota Tundra Service Manual: Front Airbag Sensor Lost Communication (RH) (B1612,B1613)

Toyota Tundra Service Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System / Front Airbag Sensor Lost Communication (RH) (B1612,B1613)

DESCRIPTION

The front airbag sensor RH circuit consists of the airbag sensor assembly and front airbag sensor RH.

The front airbag sensor RH detects impacts to the vehicle and sends signals to the airbag sensor assembly to determine if the airbag should be deployed.

DTC B1612 or B1613 is stored when a malfunction is detected in the front airbag sensor RH circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B1612

Front Airbag Sensor Lost Communication (RH)

One of the following conditions is met:

  • The airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the front airbag sensor RH circuit for 2 seconds.
  • A front airbag sensor RH malfunction.
  • An airbag sensor assembly malfunction.
  • Instrument panel wire
  • Engine room main wire
  • Front airbag sensor RH
  • Airbag sensor assembly

Comes on

Not applicable

B1613

Front Airbag Sensor Initialization Error (RH)

One of the following conditions is met:

  • The airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the front airbag sensor RH circuit for 2 seconds.
  • A front airbag sensor RH malfunction.
  • An airbag sensor assembly malfunction.
  • Instrument panel wire
  • Engine room main wire
  • Front airbag sensor RH
  • Airbag sensor assembly

Comes on

Not applicable

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

PROCEDURE

1.

CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Check that the connectors are properly connected to the airbag sensor assembly and front airbag sensor RH.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY

OK

2.

CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor assembly and front airbag sensor RH.

(b) Check that the connectors (on the airbag sensor assembly side and front airbag sensor RH side) are not damaged.

OK:

The connectors are not deformed or damaged.

*1

Front Airbag Sensor RH

*2

Airbag Sensor Assembly

*3

Engine Room Main Wire

*4

Instrument Panel Wire

NG

REPLACE INSTRUMENT PANEL WIRE OR ENGINE ROOM MAIN WIRE

OK

3.

CHECK FRONT AIRBAG SENSOR RH CIRCUIT

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

*1

Front Airbag Sensor RH

*2

Airbag Sensor Assembly

*3

Engine Room Main Wire

*4

Instrument Panel Wire

*5

Service Wire

*a

Front view of wire harness connector

(to Front Airbag Sensor RH)

*b

Front view of wire harness connector

(to Airbag Sensor Assembly)

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A1-2 (+SR) - Body ground

Ignition switch ON

Below 1 V

A1-1 (-SR) - Body ground

Ignition switch ON

Below 1 V

(d) Turn the ignition switch off.

(e) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(f) Using a service wire, connect terminals 29 (+SR) and 28 (-SR) of connector B.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

(g) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A1-2 (+SR) - A1-1 (-SR)

Always

Below 1 Ω

(h) Disconnect the service wire from connector B.

(i) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A1-2 (+SR) - A1-1 (-SR)

Always

1 MΩ or higher

A1-2 (+SR) - Body ground

Always

1 MΩ or higher

A1-1 (-SR) - Body ground

Always

1 MΩ or higher

NG

GO TO STEP 5

OK

4.

CHECK FRONT AIRBAG SENSOR RH

(a) Connect the connectors to the airbag sensor assembly.

*1

Front Airbag Sensor LH

*2

Airbag Sensor Assembly

(b) Interchange the front airbag sensor RH with LH and connect the connectors to them.

(c) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(d) Turn the ignition switch to ON, and wait for at least 60 seconds.

(e) Clear the DTCs stored in memory.

Click here

(f) Turn the ignition switch off.

(g) Turn the ignition switch to ON, and wait for at least 60 seconds.

(h) Check for DTCs.

Click here

Result

Proceed to

DTC B1612 or B1613 is output

A

DTC B1617 or B1618 is output

B

DTC B1612, B1613, B1617 and B1618 are not output

C

HINT:

Codes other than DTC B1612, B1613, B1617 and B1618 may be output at this time, but they are not related to this check.

(i) Turn the ignition switch off.

(j) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(k) Return the front airbag sensor LH and RH to their original positions and connect the connectors to them.

A

REPLACE AIRBAG SENSOR ASSEMBLY

B

REPLACE FRONT AIRBAG SENSOR RH

C

USE SIMULATION METHOD TO CHECK

5.

CHECK INSTRUMENT PANEL WIRE

(a) Disconnect the instrument panel wire connector from the engine room main wire.

*1

Front Airbag Sensor RH

*2

Airbag Sensor Assembly

*3

Engine Room Main Wire

*4

Instrument Panel Wire

*5

Service Wire

*a

Front view of wire harness connector

(to Engine Room Main Wire)

*b

Front view of wire harness connector

(to Airbag Sensor Assembly)

(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(c) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

AJ1-2 (+SR) - Body ground

Ignition switch ON

Below 1 V

AJ1-1 (-SR) - Body ground

Ignition switch ON

Below 1 V

(e) Turn the ignition switch off.

(f) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(g) Using a service wire, connect terminals 29 (+SR) and 28 (-SR) of connector B.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

(h) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

AJ1-2 (+SR) - AJ1-1 (-SR)

Always

Below 1 Ω

(i) Disconnect the service wire from connector B.

(j) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

AJ1-2 (+SR) - AJ1-1 (-SR)

Always

1 MΩ or higher

AJ1-2 (+SR) - Body ground

Always

1 MΩ or higher

AJ1-1 (-SR) - Body ground

Always

1 MΩ or higher

OK

REPLACE ENGINE ROOM MAIN WIRE

NG

REPLACE INSTRUMENT PANEL WIRE

    Front Airbag Sensor (RH) (B1610)

    Front Airbag Sensor (LH) (B1615)

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