Toyota CH-R Service Manual: Lost Communication with Front Airbag Sensor LH (B1617/84,B1618/84)

Toyota CH-R Service Manual / Supplemental Restraint Systems / Airbag System / Lost Communication with Front Airbag Sensor LH (B1617/84,B1618/84)

DESCRIPTION

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

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

These DTCs are stored when a malfunction is detected in the front airbag sensor LH circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1617/84

Lost Communication with Front Airbag Sensor LH

Any of the following conditions is met:

  • The airbag sensor assembly detects a line short in the front airbag sensor LH circuit.
  • The airbag sensor assembly detects a short to ground in the front airbag sensor LH circuit.
  • The airbag sensor assembly detects a short to B+ in the front airbag sensor LH circuit.
  • The airbag sensor assembly detects an open in the front airbag sensor LH circuit.
  • Front airbag sensor LH malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • Engine room main wire
  • Front airbag sensor LH
  • Airbag sensor assembly

Does not apply to test/check mode

B1618/84

Front Airbag Sensor LH Initialization Incomplete

Any of the following conditions is met:

  • The airbag sensor assembly detects a line short in the front airbag sensor LH circuit.
  • The airbag sensor assembly detects a short to ground in the front airbag sensor LH circuit.
  • The airbag sensor assembly detects a short to B+ in the front airbag sensor LH circuit.
  • The airbag sensor assembly detects an open in the front airbag sensor LH circuit.
  • Front airbag sensor LH malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • Engine room main wire
  • Front airbag sensor LH
  • Airbag sensor assembly

Does not apply to test/check mode
DTC Detection Conditions (B1617/84):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Pattern 5

Pattern 6

Diagnosis Condition

Ignition switch ON

○

○

○

○

○

○

Malfunction Status

The airbag sensor assembly detects a line short in the front airbag sensor LH circuit

○

-

-

-

-

-

The airbag sensor assembly detects a short to ground in the front airbag sensor LH circuit

-

○

-

-

-

-

The airbag sensor assembly detects a short to B+ in the front airbag sensor LH circuit

-

-

○

-

-

-

The airbag sensor assembly detects an open in the front airbag sensor LH circuit

-

-

-

○

-

-

Front airbag sensor LH malfunction

-

-

-

-

○

-

Airbag sensor assembly malfunction

-

-

-

-

-

○

Detection Time

-

-

-

-

-

-

Number of Trips

1 trip

1 trip

1 trip

1 trip

1 trip

1 trip
DTC Detection Conditions (B1618/84):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Pattern 5

Pattern 6

Diagnosis Condition

Ignition switch ON

○

○

○

○

○

○

Malfunction Status

The airbag sensor assembly detects a line short in the front airbag sensor LH circuit

○

-

-

-

-

-

The airbag sensor assembly detects a short to ground in the front airbag sensor LH circuit

-

○

-

-

-

-

The airbag sensor assembly detects a short to B+ in the front airbag sensor LH circuit

-

-

○

-

-

-

The airbag sensor assembly detects an open in the front airbag sensor LH circuit

-

-

-

○

-

-

Front airbag sensor LH malfunction

-

-

-

-

○

-

Airbag sensor assembly malfunction

-

-

-

-

-

○

Detection Time

-

-

-

-

-

-

Number of Trips

1 trip

1 trip

1 trip

1 trip

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

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

PROCEDURE

1.

CHECK CONNECTORS

(a) Turn the ignition switch off.

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

CAUTION:

Wait at least 90 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 sensor assembly and front airbag sensor LH. Also check that the connectors that link the engine room main wire and instrument panel wire are properly connected.

OK:

The connectors are properly connected.

HINT:

If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

(d) Disconnect the connectors from the airbag sensor assembly and front airbag sensor LH. Also disconnect the connectors that link the engine room main wire and instrument panel wire.

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

OK:

The terminals are not deformed or damaged.

NG

REPLACE WIRE HARNESS
OK

2.

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)

(a) Connect the connectors that link the engine room main wire and instrument panel wire.

*A

w/o Occupant Classification System

*B

w/ Occupant Classification System

*1

Front Airbag Sensor LH

*2

Airbag Sensor Assembly

*3

Service Wire

-

-

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Front Airbag Sensor LH)

(b) Using a service wire, connect terminals 30 (+SL) and 28 (-SL) of connector B.

NOTICE:

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A7-2 (+SL) - A7-1 (-SL)

Always

Below 1 Ω
NG

GO TO STEP 10

OK

3.

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)

(a) Disconnect the service wire from connector B.

*A

w/o Occupant Classification System

*B

w/ Occupant Classification System

*1

Front Airbag Sensor LH

*2

Airbag Sensor Assembly

*a

Front view of wire harness connector

(to Front Airbag Sensor LH)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A7-2 (+SL) - A7-1 (-SL)

Always

1 MΩ or higher
NG

GO TO STEP 9

OK

4.

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+)

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

*A

w/o Occupant Classification System

*B

w/ Occupant Classification System

*1

Front Airbag Sensor LH

*2

Airbag Sensor Assembly

*a

Front view of wire harness connector

(to Front Airbag Sensor LH)

-

-

(b) Turn the ignition switch ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A7-2 (+SL) - Body ground

Ignition switch ON

Below 1 V

A7-1 (-SL) - Body ground

Ignition switch ON

Below 1 V

(d) Turn the ignition switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NG

GO TO STEP 8

OK

5.

CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND)

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

*A

w/o Occupant Classification System

*B

w/ Occupant Classification System

*1

Front Airbag Sensor LH

*2

Airbag Sensor Assembly

*a

Front view of wire harness connector

(to Front Airbag Sensor LH)

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

A7-2 (+SL) - Body ground

Always

1 MΩ or higher

A7-1 (-SL) - Body ground

Always

1 MΩ or higher
NG

GO TO STEP 7

OK

6.

CHECK FRONT AIRBAG SENSOR LH

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

*A

w/o Occupant Classification System

*B

w/ Occupant Classification System

*1

Front Airbag Sensor RH

*2

Airbag Sensor Assembly

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

(c) Connect the cable to the negative (-) battery terminal.

(d) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the ignition switch off.

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

(g) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B1612/83, B1613/83, B1617/84 and B1618/84 may be output at this time, but they are not related to this check.

Result

Proceed to

DTCs B1612/83, B1613/83, B1617/84 and B1618/84 are not output.

A

DTC B1617/84 or B1618/84 is output.

B

DTC B1612/83 or B1613/83 is output.

C

(h) Turn the ignition switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIRBAG SENSOR ASSEMBLY

C

REPLACE FRONT AIRBAG SENSOR LH

7.

CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

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

*A

w/o Occupant Classification System

*B

w/ Occupant Classification System

*1

Front Airbag Sensor LH

*2

Airbag Sensor Assembly

*3

Engine Room Main Wire

*4

Instrument Panel Wire

*a

Front view of wire harness connector

(to Engine Room Main Wire)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

AF5-2 (+SL) - Body ground

Always

1 MΩ or higher

AF5-1 (-SL) - Body ground

Always

1 MΩ or higher
OK

REPLACE ENGINE ROOM MAIN WIRE
NG

REPLACE INSTRUMENT PANEL WIRE

8.

CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

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

*A

w/o Occupant Classification System

*B

w/ Occupant Classification System

*1

Front Airbag Sensor LH

*2

Airbag Sensor Assembly

*3

Engine Room Main Wire

*4

Instrument Panel Wire

*a

Front view of wire harness connector

(to Engine Room Main Wire)

-

-

(b) Connect the cable to the negative (-) battery terminal.

(c) Turn the ignition switch ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

AF5-2 (+SL) - Body ground

Ignition switch ON

Below 1 V

AF5-1 (-SL) - Body ground

Ignition switch ON

Below 1 V
OK

REPLACE ENGINE ROOM MAIN WIRE
NG

REPLACE INSTRUMENT PANEL WIRE

9.

CHECK INSTRUMENT PANEL WIRE (SHORT)

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

*A

w/o Occupant Classification System

*B

w/ Occupant Classification System

*1

Front Airbag Sensor LH

*2

Airbag Sensor Assembly

*3

Engine Room Main Wire

*4

Instrument Panel Wire

*a

Front view of wire harness connector

(to Engine Room Main Wire)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

AF5-2 (+SL) - AF5-1 (-SL)

Always

1 MΩ or higher
OK

REPLACE ENGINE ROOM MAIN WIRE
NG

REPLACE INSTRUMENT PANEL WIRE

10.

CHECK INSTRUMENT PANEL WIRE (OPEN)

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

*A

w/o Occupant Classification System

*B

w/ Occupant Classification System

*1

Front Airbag Sensor LH

*2

Airbag Sensor Assembly

*3

Engine Room Main Wire

*4

Instrument Panel Wire

*5

Service Wire

-

-

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

*b

Front view of wire harness connector

(to Engine Room Main Wire)

HINT:

The service wire has already been inserted into connector B.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

AF5-2 (+SL) - AF5-1 (-SL)

Always

Below 1 Ω

(c) Disconnect the service wire from connector B.

OK

REPLACE ENGINE ROOM MAIN WIRE
NG

REPLACE INSTRUMENT PANEL WIRE
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