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Toyota Corolla Repair Manual: Source voltage drop

The srs is equipped with a voltageincrease circuit (dcdc converter) in the airbag sensor assy center in case the source voltage drops.

When the battery voltage drops, the voltageincrease circuit (dcdc converter) functions to increase the voltage of the srs to normal voltage.

The diagnosis system malfunction display for this circuit is different from other circuits that is when the srs warning light remains lit up and the dtc is a normal code, source voltage drop is indicated.

Malfunction in this circuit is not recorded in the airbag sensor assy center, and the source voltage returns to normal, the srs warning light automatically goes off.

Wiring diagram

Wiring diagram

Inspection procedure

Source voltage drop
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Inspection procedure
1 Prepare for inspection Disconnect the negative () terminal cable from the battery, and wait at least for 90 seconds.  remove the horn button assy .  disconnect the connector of ...

Other materials:

Amplifier antenna assy
Replacement Hint: components: Remove roof headlining assy Notice: do not bend the roof headlining assy. Hint: refer to the procedure from remove roof headlining assy of roof headlining assy. Remove the related parts as long as the amplifier antenna assy can be removed. ...

How to use this manual
General information 1. General description This manual is made in accordance with sae j2008.  generally, repair operations can be separated in the following 3 main processes:  Diagnosis  Removing/installing, replacing, disassembling/reassembling, checking and adju ...

Circuit description
The p squib (2nd step) circuit consists of the airbag sensor assy center and instrument panel passenger airbag assy. It causes the srs to deploy when the srs deployment conditions are satisfied. Dtc b1185/57 is recorded when a short is detected in the p squib (2nd step) circuit. Wiri ...

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