Toyota Corolla Quiz
Diagnostics

Inspection procedure

In this manual: Diagnostics
Introduction — 31Preparation — 32Service specifications — 19Diagnostics — 497Engine control system — 6Fuel — 13Emission control — 28Exhaust — 3Cooling — 13Lubrication — 7Ignition — 3Starting & charging — 13Front suspension — 12Rear suspension — 9Tire & wheel — 1Drive shaft / propeller shaft — 15Brake — 42Automatic transmission / trans — 47Clutch — 19Steering column — 9Power steering — 11Heater & air conditioner — 20Supplemental restraint system — 27Seat belt — 12Lighting — 18Wiper & washer — 9Audio & visual — 12Wiring — 1Communication system — 1Windshield/windowglass/mirror — 31Seat — 10Theft deterrent & door lock — 10Sliding roof/convertible — 8Engine hood/door — 12Exterior/interior trim — 20Vehicle control system — 1Cruise control — 5Maintenance — 8
4steps
~24min
2/5difficulty
Done 0 of 4
1 Check low pitched horn assy
Toyota Corolla. Check low pitched horn assy
  1. 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 (marking: horn)
2 Check relay (marking: horn)
Toyota Corolla. Check relay
  1. Remove the relay from the engine room j/b.
  2. check the horn relay continuity, as shown in the illustration and table.

Standard:

3 Check wire harness (tvip ecu  engine room j/b)
3 Check wire harness (tvip ecu engine room j/b)
Toyota Corolla. Check wire harness
  1. Remove the horn relay from the engine room j/b.
  2. check the continuity between the terminals of the tvip ecu and engine room j/b connectors, as shown in the illustration and table.

Standard:

*: Horn relay terminal

*: Horn relay terminal

4 Check wire harness (engine room j/b  horn)
4 Check wire harness (engine room j/b horn)
Toyota Corolla. Check wire harness
  1. Check the continuity between the terminals of the engine room j/b and horn connectors, as shown in the illustration and table.

Standard:

*: Horn relay terminal.

*: Horn relay terminal.

Check and replace tvip ecu
Check and replace tvip ecu

Test yourself

A quick Toyota Corolla quiz: every answer comes with an explanation and a link to the manual page.