Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Supplemental restraint system / Source voltage drop / Source voltage drop
Toyota Corolla (E120): Source voltage drop
The srs is equipped with a voltage–increase circuit (dc–dc converter) in the airbag sensor assy center in case the source voltage drops.
When the battery voltage drops, the voltage–increase circuit (dc–dc 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
Other materials:
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 ...
Basic inspection
Resistance measuring condition of electronic parts
unless stated, all resistance is measured at an ambient
temperature of 20 c (68 °F). As the resistance
may be outside the specifications if measured at high temperatures
immediately after
the vehicle has been running, measu ...
Cooling
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