Toyota CH-R Service Manual: Short in Driver Side Squib 2nd Step Circuit (B1810/53-B1813/53)

Toyota CH-R Service Manual / Supplemental Restraint Systems / Airbag System / Short in Driver Side Squib 2nd Step Circuit (B1810/53-B1813/53)

DESCRIPTION

The driver side squib 2nd step circuit consists of the airbag sensor assembly, spiral cable with sensor sub-assembly and horn button 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 driver side squib 2nd step circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1810/53

Short in Driver Side Squib 2nd Step Circuit

Any of the following conditions is met:

  • The airbag sensor assembly detects a line short in the driver side squib 2nd step circuit during the primary check.
  • Spiral cable with sensor sub-assembly malfunction
  • Driver side squib 2nd step malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • Spiral cable with sensor sub-assembly
  • Driver side squib 2nd step (Horn button assembly)
  • Airbag sensor assembly

Applies to check mode

B1811/53

Open in Driver Side Squib 2nd Step Circuit

Any of the following conditions is met:

  • The airbag sensor assembly detects an open in the driver side squib 2nd step circuit.
  • Spiral cable with sensor sub-assembly malfunction
  • Driver side squib 2nd step malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • Spiral cable with sensor sub-assembly
  • Driver side squib 2nd step (Horn button assembly)
  • Airbag sensor assembly

Applies to check mode

B1812/53

Short to GND in Driver Side Squib 2nd Step Circuit

Any of the following conditions is met:

  • The airbag sensor assembly detects a short to ground in the driver side squib 2nd step circuit.
  • Spiral cable with sensor sub-assembly malfunction
  • Driver side squib 2nd step malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • Spiral cable with sensor sub-assembly
  • Driver side squib 2nd step (Horn button assembly)
  • Airbag sensor assembly

Applies to check mode

B1813/53

Short to B+ in Driver Side Squib 2nd Step Circuit

Any of the following conditions is met:

  • The airbag sensor assembly detects a short to B+ in the driver side squib 2nd step circuit.
  • Spiral cable with sensor sub-assembly malfunction
  • Driver side squib 2nd step malfunction
  • Airbag sensor assembly malfunction
  • Instrument panel wire
  • Spiral cable with sensor sub-assembly
  • Driver side squib 2nd step (Horn button assembly)
  • Airbag sensor assembly

Applies to check mode

DTC Detection Conditions (B1810/53):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

Ignition switch ON

Malfunction Status

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

-

-

-

Spiral cable with sensor sub-assembly malfunction

-

-

-

Driver side squib 2nd step malfunction

-

-

-

Airbag sensor assembly malfunction

-

-

-

Detection Time

-

-

-

-

Number of Trips

1 trip

1 trip

1 trip

1 trip

DTC Detection Conditions (B1811/53):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

Ignition switch ON

Malfunction Status

The airbag sensor assembly detects an open in the driver side squib 2nd step circuit

-

-

-

Spiral cable with sensor sub-assembly malfunction

-

-

-

Driver side squib 2nd step malfunction

-

-

-

Airbag sensor assembly malfunction

-

-

-

Detection Time

-

-

-

-

Number of Trips

1 trip

1 trip

1 trip

1 trip

DTC Detection Conditions (B1812/53):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

Ignition switch ON

Malfunction Status

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

-

-

-

Spiral cable with sensor sub-assembly malfunction

-

-

-

Driver side squib 2nd step malfunction

-

-

-

Airbag sensor assembly malfunction

-

-

-

Detection Time

-

-

-

-

Number of Trips

1 trip

1 trip

1 trip

1 trip

DTC Detection Conditions (B1813/53):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

Ignition switch ON

Malfunction Status

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

-

-

-

Spiral cable with sensor sub-assembly malfunction

-

-

-

Driver side squib 2nd step malfunction

-

-

-

Airbag sensor assembly malfunction

-

-

-

Detection Time

-

-

-

-

Number of Trips

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

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

Horn Button Assembly

*2

Spiral Cable with Sensor Sub-assembly

*3

Airbag Sensor Assembly

*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 horn button assembly, spiral cable with sensor sub-assembly and airbag sensor assembly.

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 horn button assembly, spiral cable with sensor sub-assembly and airbag sensor assembly.

(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 spiral cable with sensor sub-assembly connector (on the horn button 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 spiral cable with sensor sub-assembly connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

NG

REPLACE WIRE HARNESS

OK

2.

CHECK HORN BUTTON ASSEMBLY

(a) Connect the instrument panel wire to the airbag sensor assembly and spiral cable with sensor sub-assembly.

*1

Horn Button Assembly

*2

Spiral Cable with Sensor Sub-assembly

*3

Airbag Sensor Assembly

*a

Front view of wire harness connector

(to Horn Button Assembly)

*b

Color: Black

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

CAUTION:

Never connect a tester to the horn button 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, and wait for at least 60 seconds.

(g) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1810/53, B1811/53, B1812/53 or B1813/53 is not output.

HINT:

Codes other than DTCs B1810/53, B1811/53, B1812/53 and B1813/53 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 HORN BUTTON ASSEMBLY

NG

3.

CHECK DRIVER SIDE SQUIB 2ND STEP CIRCUIT

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

*1

Horn Button Assembly

*2

Spiral Cable with Sensor Sub-assembly

*3

Airbag Sensor Assembly

*a

Front view of wire harness connector

(to Horn Button 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.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

z15-2 - Body ground

Ignition switch ON

Below 1 V

z15-1 - Body ground

Ignition switch ON

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

z15-2 - z15-1

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

z15-2 - Body ground

Always

1 MΩ or higher

z15-1 - 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

z15-2 - z15-1

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 horn button assembly and airbag sensor assembly.

*1

Horn Button Assembly

*2

Spiral Cable with Sensor Sub-assembly

*3

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, and wait for at least 60 seconds.

(f) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1810/53, B1811/53, B1812/53 or B1813/53 is not output.

HINT:

Codes other than DTCs B1810/53, B1811/53, B1812/53 and B1813/53 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 instrument panel wire from the spiral cable with sensor sub-assembly.

*1

Horn Button Assembly

*2

Spiral Cable with Sensor Sub-assembly

*3

Front Airbag Sensor

*4

Instrument Panel Wire

*a

Front view of wire harness connector

(to Spiral Cable with Sensor Sub-assembly)

(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.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F30-4 (D2+) - Body ground

Ignition switch ON

Below 1 V

F30-3 (D2-) - Body ground

Ignition switch ON

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

F30-4 (D2+) - F30-3 (D2-)

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

F30-4 (D2+) - Body ground

Always

1 MΩ or higher

F30-3 (D2-) - 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

F30-4 (D2+) - F30-3 (D2-)

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 SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

(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.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

z15-2 - Body ground

Ignition switch ON

Below 1 V

z15-1 - Body ground

Ignition switch ON

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

Horn Button Assembly

*2

Spiral Cable with Sensor Sub-assembly

*3

Front Airbag Sensor

*4

Instrument Panel Wire

*a

Front view of wire harness connector

(to Horn Button 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

z15-2 - z15-1

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

z15-2 - Body ground

Always

1 MΩ or higher

z15-1 - 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

z15-2 - z15-1

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 SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

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