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Toyota Corolla Repair Manual: Circuit description

When the tvip system is transferred from the armed state to the alarm sounding state, the tvip ecu switches on the horn relay so that it can sound the horns. The horn sounds in 0.4 Seconds interval.

Wiring diagram

Inspection procedure

Horn relay circuit

Inspection procedure
1 Check low pitched horn assy Connect the positive (+) lead from the battery to the terminal and negative () lead to the horn body, and check that the horn blows. 2 Check relay (ma ...

Other materials:

Circuit description
Refer to dtc p0115 Dtc no. Dtc detection condition Trouble area P0116 If engine coolant temperature (ect) was between 35 c (95 F) and 60 c (140 F) when starting the engine, and also conditions (a) and (b) are met:  vehicle has run with acceleration and ...

General information
There are many ecu controlled systems used in the corolla. In general, ecu controlled system are considered to be very intricate and require a high level of technical knowledge and expert skill to troubleshoot. The fact is, however, that if you proceed by inspecting the circuits one by one, ...

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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