Toyota Corolla (E120): Inspection
1. Headlamp dimmer switch assy

- Inspect light control switch continuity.
- Measure the resistance according to the value(s) in the table below.
Standard:

- Inspect headlight dimmer switch continuity.
- Measure the resistance according to the value(s) in the table below.
Standard:

Hint
: turn light control switch to the head position when checking ”low beam” and ”hi beam”.
- inspect turn signal switch continuity.
- Measure the resistance according to the value(s) in the table below.
Standard:

- W/ fog light: inspect front fog light switch continuity.
- Measure the resistance according to the value(s) in the table below.
Standard:

2. Back up lamp switch assy
- measure the resistance according to the value(s) in the table below.
Standard:

3. Stop lamp switch assy (w/o cruise control)
- measure the resistance according to the value(s) in the table below.
Standard:

4. Stop lamp switch assy (w/ cruise control)

- Measure the resistance according to the value(s) in the table below.
Standard:

5. Hazard warning signal switch assy

- Measure the resistance according to the value(s) in the table below.
Standard:

- Inspect illumination operation.
- Connect the positive (+) lead from the battery to terminal 5 and the negative (–) lead to terminal 4, then check that the illumination comes on.
6. Front door courtesy lamp switch assy
- measure the resistance according to the value(s) in the table below.
Standard:

7. Rear door courtesy lamp switch assy
- measure the resistance according to the value(s) in the table below.
Standard:

8. Luggage compartment room courtesy lamp switch assy
- measure the resistance according to the value(s) in the table below.
Standard:

9. Map lamp assy (w/o sliding roof)

- Measure the resistance according to the value(s) in the table below.
Standard:

- Connect the positive (+) lead from the battery to terminal 1 and the negative (–) lead to terminal 6, then check that the illumination comes on when switch operation is on position.
10. Map lamp assy (w/ sliding roof)

- Measure the resistance according to the value(s) in the table below.
Standard:

- Connect the positive (+) lead from the battery to terminal 1 and the negative (–) lead to terminal 3, then check that the illumination comes on when switch operation is on position.
11. Room lamp assy no.1

- Connect the positive (+) lead from the battery to terminal 1 and the negative (–) lead to terminal 2, then check that the illumination comes on .
13. Headlamp relay

- Measure the resistance according to the value(s) in the table below.
Standard:

14. Fog lamp relay

- Measure the resistance according to the value(s) in the table below.
Standard:

15. Taillamp relay

- Measure the resistance according to the value(s) in the table below.
Standard:

16. Headlamp dimmer relay

- Measure the resistance according to the value(s) in the table below.
Standard:

17. Light control rheostat

- Connect the connector to the rheostat and inspect the wire harness side connector from the back side as shown in the table below.
Standard:

- Inspect illumination operation.
- Connect the positive (+) lead from the battery to terminal 2 and the negative (–) lead to terminal 3, then check that the illumination comes on.
Other materials:
Problem symptoms table
Hint:
proceed with troubleshooting of each circuit in the table below.
Symptom
Suspect area
When the ignition switch is in the on position, the srs warning
light sometimes comes on after approximately 6 seconds.
Srs warning light ci ...
Inspection procedure
1 Check d squib circuit(airbag sensor assy center – horn button
assy)
Disconnect the negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
disconnect the connectors between the airbag sensor
assy center and the horn button assy.
for the oran ...
LTA (Lane Tracing Assist)
LTA functions
When driving on a road with
clear lane lines with the
dynamic radar cruise control
operating, lane lines and preceding
and surrounding vehicles
are detected using the
front camera and radar sensor,
and the steering wheel is
operated to maintain the vehicle's
lane position.
...


