Toyota Tacoma manuals

Toyota Corolla Repair Manual: Circuit inspection

1 Check d squib circuit(airbag sensor assy center horn button assy)

  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 black connector (on the spiral cable subassy side) between the horn button assy and the spiral cable subassy, measure the voltage between d2+ and body ground.

    Ok: voltage: below 1 v

2 Check air bag sensor assy center

2 Check air bag sensor assy center

Sst 0984318040

  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 d2+ and d2 of the black connector (on the spiral cable subassy side) between the horn button assy and the spiral cable subassy.
  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 20 seconds.
  10.  check the dtc .

    Ok: dtc b1183/22 is not output.

Hint

: codes other than code b1183/22 may be output at this time, but they are not relevant to this check.

3 Check d squib

3 Check d squib

Sst 0984318040

  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 b1183/22 is not output.

Hint

: codes other than code b1183/22 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 subassy)

  1. Turn the ignition switch to lock.
  2.  disconnect the connector of the instrument panel wire.
  3.  turn the ignition switch to on.
  4. ) for the connector (on the spiral cable subassy side) between the horn button assy and the spiral cable subassy, measure the voltage between d2+ and body ground.

    Ok: voltage: below 1 v

6 Check spiral cable subassy

6 Check spiral cable subassy

  1. For the black connector (on the spiral cable subassy side) between the horn button assy and the spiral cable subassy, measure the voltage between d2+ 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

Circuit description
The d squib (2nd step) circuit consists of the airbag sensor assy center, spiral cable subassy and horn button assy. It causes the srs to deploy when the srs deployment conditions are satisfied ...

Short in p squib (2nd step) circuit
Dtc b1185/57 short in p squib (2nd step) circuit ...

Other materials:

Glossary of tire terminology
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Overhaul
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Symptom confirmation and diagnostic trouble code
Hint: the diagnostic system in corolla has various functions. The first function is the diagnostic trouble code (dtc) check, in which a malfunction in the signal circuits to the ecu is stored in code form in the ecu memory. Another function is the input signal check, which checks if ...

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