Toyota Tundra Service Manual: P Seat Airbag Active Mode Indicator (B1660)

DESCRIPTION

The passenger airbag ON/OFF indicator circuit consists of the airbag sensor assembly and passenger airbag ON/OFF indicator.

The passenger airbag ON/OFF indicator indicates the operation condition of the lower No. 2 instrument panel airbag assembly, instrument panel passenger without door airbag assembly and front seat airbag assembly RH.

DTC B1660 is stored when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B1660

P Seat Airbag Active Mode Indicator

One of the following conditions is met:

  • The airbag sensor assembly detects a line short, short to ground or B+, or an open in the passenger airbag ON/OFF indicator circuit.
  • Passenger airbag ON/OFF indicator malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • Air conditioning control assembly (passenger airbag ON/OFF indicator)
  • An 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 PASSENGER AIRBAG ON/OFF INDICATOR CONDITION

(a) Turn the ignition switch to ON.

(b) Check the passenger airbag ON/OFF indicator operation.

HINT:

Refer to the normal condition of the passenger airbag ON/OFF indicator.

Click here

Result

Proceed to

ON/OFF indicator illumination is always on.

A

ON/OFF indicator illumination is always off.

B

B

GO TO STEP 7

A

2.

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 air conditioning control assembly.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY

OK

3.

CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor assembly and telltale light assembly.

*1

Air Conditioning Control Assembly

*2

Airbag Sensor Assembly

*3

Harness and Connector

(b) Check that the connectors (on the airbag sensor assembly side and air conditioning control assembly side) are not damaged.

OK:

The connectors are not deformed or damaged.

NG

REPLACE HARNESS AND CONNECTOR

OK

4.

CHECK PASSENGER AIRBAG ON/OFF INDICATOR

(a) Connect the connector to the ari conditioning control 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) Check the passenger airbag ON/OFF indicator operation.

OK:

The passenger airbag ON/OFF indicator does not come on.

NG

GO TO STEP 6

OK

5.

CHECK DTC

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

*1

Air Conditioning Control Assembly

*2

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, and wait for at least 60 seconds.

(d) Clear the DTCs.

Click here

(e) Turn the ignition switch off.

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

(g) Check for DTCs.

Click here

Result

Proceed to

DTC B1660 is not output

A

DTC B1660 is output

B

HINT:

Codes other than DTC B1660 may be output at this time, but they are not related to this check.

A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIRBAG SENSOR ASSEMBLY

6.

CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT

(a) Disconnect the connector from the airbag sensor assembly and air conditioning control assembly.

*1

Air Conditioning Control Assembly

*2

Airbag Sensor Assembly

*3

Harness and Connector

*4

Service Wire

*a

Front view of wire harness connector

(to Air Conditioning Control Assembly)

*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

J127-2 (P-AB) - Body ground

Ignition switch ON

Below 1 V

J127-3 (PAON) - 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 35 (PAON) and 34 (P-AB) 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

J127-2 (P-AB) - J127-3 (PAON)

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

J127-2 (P-AB) - J127-3 (PAON)

Always

1 MΩ or higher

J127-2 (P-AB) - Body ground

Always

1 MΩ or higher

J127-3 (PAON) - Body ground

Always

1 MΩ or higher

OK

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

NG

REPLACE HARNESS AND CONNECTOR

7.

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 air conditioning control assembly.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY

OK

8.

CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor assembly and air conditioning control assembly.

*1

Air Conditioning Control Assembly

*2

Airbag Sensor Assembly

*3

Harness and Connector

(b) Check that the connectors (on the airbag sensor assembly side and air conditioning control assembly side) are not damaged.

OK:

The connectors are not deformed or damaged.

NG

REPLACE HARNESS AND CONNECTOR

OK

9.

CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT

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

*1

Air Conditioning Control Assembly

*2

Airbag Sensor Assembly

*3

Instrument Panel Wire

*4

Service Wire

*a

Front view of wire harness connector

(to Air Conditioning Control Assembly)

*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

J127-2 (P-AB) - Body ground

Ignition switch ON

Below 1 V

J127-3 (PAON) - 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 35 (PAON) and 34 (P-AB) 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

J127-2 (P-AB) - J127-3 (PAON)

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

J127-2 (P-AB) - J127-3 (PAON)

Always

1 MΩ or higher

J127-2 (P-AB) - Body ground

Always

1 MΩ or higher

J127-3 (PAON) - Body ground

Always

1 MΩ or higher

NG

REPLACE HARNESS AND CONNECTOR

OK

10.

CHECK PASSENGER AIRBAG ON/OFF INDICATOR (SOURCE VOLTAGE)

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

*a

Front view of wire harness connector

(to Air Conditioning Control 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

J127-4 (IG+) - Body ground

Ignition switch ON

11 to 14 V

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

11.

CHECK PASSENGER AIRBAG ON/OFF INDICATOR

(a) Turn the ignition switch off.

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

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

(c) Connect the connector to the air conditioning control assembly.

(d) Using a service wire, connect terminal 35 (PAON) and body ground.

(e) Using a service wire, connect terminal 34 (P-AB) and body ground.

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

(g) Turn the ignition switch to ON.

(h) Check the indicator according to the table below.

OK:

Tester Connection

Switch Condition

Passenger Airbag ON/OFF Indicator

J177-35 (PAON) - Body ground

Ignition switch ON

"ON" comes on

J177-34 (P-AB) - Body ground

Ignition switch ON

"OFF" comes on

(i) Disconnect the service wire from airbag sensor assembly.

NG

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

OK

12.

CHECK DTC

(a) Turn the ignition switch off.

*1

Air Conditioning Control Assembly

*2

Airbag Sensor Assembly

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

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

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

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

(f) Clear the DTCs.

Click here

(g) Turn the ignition switch off.

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

(i) Check for DTCs.

Click here

Result

Proceed to

DTC B1660 is not output

A

DTC B1660 is output

B

HINT:

Codes other than DTC B1660 may be output at this time, but they are not related to this check.

A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIRBAG SENSOR ASSEMBLY

    Seat Belt Buckle Switch (LH) (B1656)

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