Toyota RAV4 manuals

Toyota RAV4 Service Manual: Source voltage drop

Description

The srs is equipped with a voltage-increase circuit (dc-dc converter) in the center airbag sensor in case the source voltage drops.

When the source voltage drops, the voltage-increase circuit (dc-dc converter) functions to increase the voltage of the srs to a normal working level.

A malfunction in this circuit is displayed differently from other codes, in the fact that no dtcs are recorded. With a normal system code present, the source voltage drop is indicated when the srs warning light comes on.

A malfunction in this circuit is not recorded in the center airbag sensor .

The srs warning light automatically goes off when the source voltage returns to normal.

Wiring diagram

Toyota RAV4. Source voltage drop


Inspection procedure

  1. Check wire harness (center airbag sensor assembly - battery)

Toyota RAV4. Check wire harness (center airbag sensor assembly - battery)


  1. Turn the ignition switch off.
  2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3. Disconnect the e45 connector from the center airbag sensor .
  4. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
  5. Measure the voltage of the wire harness side connectors.

Standard voltage




  1. Check wire harness (center airbag sensor assembly - body ground)

Toyota RAV4. Check wire harness (center airbag sensor assembly - body ground)


  1. Measure the resistance of the wire harness side connectors.

Standard resistance




  1. Check wire harness (center airbag sensor assembly - body ground)

Toyota RAV4. Check wire harness (center airbag sensor assembly - body ground)


  1. Measure the resistance of the wire harness side connectors.

Standard resistance




  1. Check srs warning light

  1. Turn the ignition switch off.
  2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3. Connect the e45 center airbag sensor connector.
  4. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
  5. Turn the ignition switch on, and wait for at least 6 seconds.
  6. Operate all components of the electrical system (defogger, wiper, headlight, heater, blower, etc.) And check that the srs warning light does not come on.

Ok: srs warning light does not come on.



End

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Other materials:

Removal
Disconnect cable from negative battery terminal Caution: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation. Remove front seat track bracket outer cover lh (see page se-11) Remove fr ...

Inspection
Inspect generator brush holder assembly Using a vernier caliper, measure the brush length. Standard length: 9.5 To 11.5 Mm (0.374 To 0.453 In.) Minimum length: 4.5 Mm (0.177 In.) If the brush length is less than the minimum, replace the generator brush holder assembly. Inspe ...

On-vehicle inspection
Check steering pad assembly (vehicle not involved in collision and airbag not deployed) Perform a diagnostic system check (see page rs- 49). With the steering pad (with airbag) installed on the vehicle, perform a visual check: check for cuts, cracks or discoloration on the ...

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