Toyota CH-R Service Manual: Short in Front Passenger Side Squib 2nd Step Circuit (B1815/54-B1818/54)

Toyota CH-R Service Manual / Supplemental Restraint Systems / Airbag System / Short in Front Passenger Side Squib 2nd Step Circuit (B1815/54-B1818/54)

DESCRIPTION

The front passenger side squib 2nd step circuit consists of the airbag sensor assembly and instrument panel passenger without door airbag assembly.

The airbag sensor assembly uses this circuit to deploy the airbag when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the front passenger side squib 2nd step circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1815/54

Short in Front Passenger Side Squib 2nd Step Circuit

Any of the following conditions is met:

  • The airbag sensor assembly detects a line short in the front passenger side squib 2nd step circuit during the primary check.
  • Front passenger side squib 2nd step malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • No. 2 instrument panel wire
  • Front passenger side squib 2nd step (Instrument panel passenger without door airbag assembly)
  • Airbag sensor assembly

Applies to check mode

B1816/54

Open in Front Passenger Side Squib 2nd Step Circuit

Any of the following conditions is met:

  • The airbag sensor assembly detects an open in the front passenger side squib 2nd step circuit.
  • Front passenger side squib 2nd step malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • No. 2 instrument panel wire
  • Front passenger side squib 2nd step (Instrument panel passenger without door airbag assembly)
  • Airbag sensor assembly

Applies to check mode

B1817/54

Short to GND in Front Passenger Side Squib 2nd Step Circuit

Any of the following conditions is met:

  • The airbag sensor assembly detects a short to ground in the front passenger side squib 2nd step circuit.
  • Front passenger side squib 2nd step malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • No. 2 instrument panel wire
  • Front passenger side squib 2nd step (Instrument panel passenger without door airbag assembly)
  • Airbag sensor assembly

Applies to check mode

B1818/54

Short to B+ in Front Passenger Side Squib 2nd Step Circuit

Any of the following conditions is met:

  • The airbag sensor assembly detects a short to B+ in the front passenger side squib 2nd step circuit.
  • Front passenger side squib 2nd step malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • No. 2 instrument panel wire
  • Front passenger side squib 2nd step (Instrument panel passenger without door airbag assembly)
  • Airbag sensor assembly

Applies to check mode

DTC Detection Conditions (B1815/54):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

Ignition switch ON

Malfunction Status

The airbag sensor assembly detects a line short in the front passenger side squib 2nd step circuit during the primary check.

-

-

Front passenger side squib 2nd step malfunction

-

-

Airbag sensor assembly malfunction

-

-

Detection Time

-

-

-

Number of Trips

1 trip

1 trip

1 trip

DTC Detection Conditions (B1816/54):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

Ignition switch ON

Malfunction Status

The airbag sensor assembly detects an open in the front passenger side squib 2nd step circuit.

-

-

Front passenger side squib 2nd step malfunction

-

-

Airbag sensor assembly malfunction

-

-

Detection Time

-

-

-

Number of Trips

1 trip

1 trip

1 trip

DTC Detection Conditions (B1817/54):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

Ignition switch ON

Malfunction Status

The airbag sensor assembly detects a short to ground in the front passenger side squib 2nd step circuit.

-

-

Front passenger side squib 2nd step malfunction

-

-

Airbag sensor assembly malfunction

-

-

Detection Time

-

-

-

Number of Trips

1 trip

1 trip

1 trip

DTC Detection Conditions (B1818/54):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

Ignition switch ON

Malfunction Status

The airbag sensor assembly detects a short to B+ in the front passenger side squib 2nd step circuit.

-

-

Front passenger side squib 2nd step malfunction

-

-

Airbag sensor assembly malfunction

-

-

Detection Time

-

-

-

Number of Trips

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

HINT:

  • Perform the simulation method by selecting check mode (Signal Check) using the Techstream.

    Click here

  • After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city road or rough road.

    Click here

PROCEDURE

1.

CHECK CONNECTORS

(a) Turn the ignition switch off.

*1

Instrument Panel Passenger without Door Airbag Assembly

*2

Airbag Sensor Assembly

*3

No. 2 Instrument Panel Wire

*4

Instrument Panel Wire

(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 instrument panel passenger without door airbag assembly and airbag sensor assembly. Also check that the connectors that link the instrument panel wire and No. 2 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 instrument panel passenger without door airbag assembly and airbag sensor assembly. Also disconnect the instrument panel wire from the No. 2 instrument panel wire.

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

OK:

The terminals are not deformed or damaged.

(f) Check that the No. 2 instrument panel wire connector (on the instrument panel passenger without door airbag assembly side) is not loose, deformed or damaged.

OK:

The connector locking button is not disengaged, and the claw of the lock is not deformed or damaged.

(g) Check that the short springs of the activation prevention mechanisms of the instrument panel wire connector and No. 2 instrument panel wire connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

NG

REPLACE WIRE HARNESS

OK

2.

CHECK INSTRUMENT PANEL PASSENGER WITHOUT DOOR AIRBAG ASSEMBLY

(a) Connect the instrument panel wire to the No. 2 instrument panel wire and airbag sensor assembly.

*1

Instrument Panel Passenger without Door Airbag Assembly

*2

Airbag Sensor Assembly

*a

Front view of wire harness connector

(to Instrument Panel Passenger without Door Airbag Assembly)

*b

Color: Black

(b) Connect SST (resistance 2.1 Ω) to connector E (black connector).

CAUTION:

Never connect a tester to the instrument panel passenger without door airbag assembly for measurement, as this may lead to a serious injury due to airbag deployment.

NOTICE:

  • Do not forcibly insert SST into the terminals of the connector when connecting it.
  • Insert SST straight into the terminals of the connector.

SST: 09843-18061

(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 (IG), and wait for at least 60 seconds.

(g) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1815/54, B1816/54, B1817/54 or B1818/54 is not output.

HINT:

Codes other than DTCs B1815/54, B1816/54, B1817/54 and B1818/54 may be output at this time, but they are not related to this check.

(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) Disconnect SST from connector E.

OK

REPLACE INSTRUMENT PANEL PASSENGER WITHOUT DOOR AIRBAG ASSEMBLY

NG

3.

CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT

(a) Disconnect the instrument panel wire from the airbag sensor assembly.

*1

Instrument Panel Passenger without Door Airbag Assembly

*2

Airbag Sensor Assembly

*a

Front view of wire harness connector

(to Instrument Panel Passenger without Door Airbag Assembly)

*b

Color: Black

(b) Check for a short to B+ in the circuit.

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

(2) Turn the ignition switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

b3-2 (P2+) - Body ground

Ignition switch on (IG)

Below 1 V

b3-1 (P2-) - Body ground

Ignition switch on (IG)

Below 1 V

(4) Turn the ignition switch off.

(5) 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 for an open in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b3-2 (P2+) - b3-1 (P2-)

Always

Below 1 Ω

(d) Check for a short to ground in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b3-2 (P2+) - Body ground

Always

1 MΩ or higher

b3-1 (P2-) - Body ground

Always

1 MΩ or higher

(e) Check for a short in the circuit.

(1) Release the activation prevention mechanism built into connector B.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b3-2 (P2+) - b3-1 (P2-)

Always

1 MΩ or higher

(3) Restore the released activation prevention mechanism of connector B to the original condition.

NG

GO TO STEP 5

OK

4.

CHECK DTC

(a) Connect the connectors to the instrument panel passenger without door airbag assembly and airbag sensor assembly.

*1

Instrument Panel Passenger without Door Airbag Assembly

*2

Airbag Sensor Assembly

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

(c) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(d) Turn the ignition switch off.

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

(f) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1815/54, B1816/54, B1817/54 or B1818/54 is not output.

HINT:

Codes other than DTCs B1815/54, B1816/54, B1817/54 and B1818/54 may be output at this time, but they are not related to this check.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE AIRBAG SENSOR ASSEMBLY

5.

CHECK INSTRUMENT PANEL WIRE

(a) Disconnect the No. 2 instrument panel wire from the instrument panel wire.

*1

Instrument Panel Passenger without Door Airbag Assembly

*2

Airbag Sensor Assembly

*3

No. 2 Instrument Panel Wire

*4

Instrument Panel Wire

*a

Front view of wire harness connector

(to No. 2 Instrument Panel Wire)

(b) Check for a short to B+ in the circuit.

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

(2) Turn the ignition switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

Fb2-3 (P2+) - Body ground

Ignition switch on (IG)

Below 1 V

Fb2-4 (P2-) - Body ground

Ignition switch on (IG)

Below 1 V

(4) Turn the ignition switch off.

(5) 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 for an open in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Fb2-3 (P2+) - Fb2-4 (P2-)

Always

Below 1 Ω

(d) Check for a short to ground in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Fb2-3 (P2+) - Body ground

Always

1 MΩ or higher

Fb2-4 (P2-) - Body ground

Always

1 MΩ or higher

(e) Check for a short in the circuit.

(1) Release the activation prevention mechanism built into connector B.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Fb2-3 (P2+) - Fb2-4 (P2-)

Always

1 MΩ or higher

(3) Restore the released activation prevention mechanism of connector B to the original condition.

NG

REPLACE INSTRUMENT PANEL WIRE

OK

6.

CHECK NO. 2 INSTRUMENT PANEL WIRE

(a) Check for a short to B+ in the circuit.

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

(2) Turn the ignition switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

b3-2 (P2+) - Body ground

Ignition switch on (IG)

Below 1 V

b3-1 (P2-) - Body ground

Ignition switch on (IG)

Below 1 V

(4) Turn the ignition switch off.

(5) 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.

*1

Instrument Panel Passenger without Door Airbag Assembly

*2

Airbag Sensor Assembly

*3

No. 2 Instrument Panel Wire

*4

Instrument Panel Wire

*a

Front view of wire harness connector

(to Instrument Panel Passenger without Door Airbag Assembly)

*b

Color: Black

(b) Check for an open in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b3-2 (P2+) - b3-1 (P2-)

Always

Below 1 Ω

(c) Check for a short to ground in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b3-2 (P2+) - Body ground

Always

1 MΩ or higher

b3-1 (P2-) - Body ground

Always

1 MΩ or higher

(d) Check for a short in the circuit.

(1) Release the activation prevention mechanism built into connector D.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b3-2 (P2+) - b3-1 (P2-)

Always

1 MΩ or higher

(3) Restore the released activation prevention mechanism of connector D to the original condition.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE NO. 2 INSTRUMENT PANEL WIRE

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