Toyota Corolla Quiz
Diagnostics

Inspection procedure

In this manual: Diagnostics
Introduction — 31Preparation — 32Service specifications — 19Diagnostics — 497Engine control system — 6Fuel — 13Emission control — 28Exhaust — 3Cooling — 13Lubrication — 7Ignition — 3Starting & charging — 13Front suspension — 12Rear suspension — 9Tire & wheel — 1Drive shaft / propeller shaft — 15Brake — 42Automatic transmission / trans — 47Clutch — 19Steering column — 9Power steering — 11Heater & air conditioner — 20Supplemental restraint system — 27Seat belt — 12Lighting — 18Wiper & washer — 9Audio & visual — 12Wiring — 1Communication system — 1Windshield/windowglass/mirror — 31Seat — 10Theft deterrent & door lock — 10Sliding roof/convertible — 8Engine hood/door — 12Exterior/interior trim — 20Vehicle control system — 1Cruise control — 5Maintenance — 8
28steps
~168min
4/5difficulty
Done 0 of 28
1 Check d squib circuit(airbag sensor assy center – horn button assy)
Toyota Corolla. Check d squib circuit
  1. Disconnect the negative (–) terminal cable from the battery, and wait at least for 90 seconds.
  2. disconnect the connectors between the airbag sensor assy center and the horn button assy.
  3. connect the negative (–) terminal cable to the battery, and wait at least for 2 seconds.
  4. turn the ignition switch to on.
  5. for the orange connector (on the spiral cable sub–assy side) between the horn button assy and the spiral cable sub–assy, measure the voltage between d+ and body ground.

    Ok: voltage: below 1 v

    2 Check air bag sensor assy center
2 Check air bag sensor assy center
Toyota Corolla. Check air bag sensor assy center
  1. Turn the ignition switch to lock.
  2. disconnect the negative (–) terminal cable from the battery, and wait at least for 90 seconds.
  3. connect the connector to the airbag sensor assy center.
  4. using a service wire, connect d+ and d– of the orange connector (on the spiral cable sub–assy side) between the horn button assy and the spiral cable sub–assy.
  5. connect the negative (–) terminal cable to the battery, and wait at least for 2 seconds.
  6. turn the ignition switch to on, and wait at least for 20 seconds.
  7. clear the dtc stored in memory .
  8. turn the ignition switch to lock, and wait at least for 20 seconds.
  9. turn the ignition switch to on, and wait at least for 60 seconds.
  10. check the dtc .

    Ok: dtc b0103/12 is not output.

Hint

: codes other than code b0103/12 may be output at this time, but they are not relevant to this check.
3 Check d squib
3 Check d squib

Sst 09843–18040

Toyota Corolla. Check d squib
  1. Turn the ignition switch to lock.
  2. disconnect the negative (–) terminal cable from the battery, and wait at least for 90 seconds.
  3. connect the horn button assy connectors.
  4. connect the negative (–) terminal cable to the battery, and wait at least for 2 seconds.
  5. turn the ignition switch to on, and wait at least for 20 seconds.
  6. clear the dtc stored in memory .
  7. turn the ignition switch to lock, and wait at least for 20 seconds.
  8. turn the ignition switch to on, and wait at least for 20 seconds.
  9. check the dtc .

    Ok: dtc b0103/12 is not output.

Hint

: codes other than code b0103/12 may be output at this time, but they are not relevant to this check.
4 Use simulation method to check
4 Use simulation method to check
Replace all srs components including the wire harness
Replace all srs components including the wire harness 5 Check instrument panel wire(airbag sensor assy center – spiral cable sub–assy)
Toyota Corolla. Check instrument panel wire
  1. Turn the ignition switch to lock.
  2. disconnect the connectors of the instrument panel wire.
  3. turn the ignition switch to on.
  4. for the connector (on the spiral cable sub–assy side) between the airbag sensor assy center and the spiral cable sub–assy, measure the voltage between d+ and body ground.

    Ok: voltage: below 1 v

    6 Check spiral cable sub–assy
6 Check spiral cable sub–assy
Toyota Corolla. Check spiral cable sub–assy
  1. For the orange connector (on the spiral cable sub–assy side) between the horn button assy and the spiral cable sub–assy, measure the voltage between d+ and body ground.

    Ok: voltage: below 1 v

7 Use simulation method to check
7 Use simulation method to check
Replace all srs components including the wire harness
Replace all srs components including the wire harness

Test yourself

A quick Toyota Corolla quiz: every answer comes with an explanation and a link to the manual page.