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:
if a normal code is displayed during the dtc check but the trouble still occurs,
check the circuits for each
symptom in the order given in the charts on the following pages and proceed to
the page given for troubleshooting.
The matrix chart is divided into 3 chapters.
If the instruc ...
Circuit description
Refer to dtc p0115
Dtc no.
Dtc detection condition
Trouble area
P0125
If the engine coolant temperature (ect) was less than –6.6 °C
(20 °F) when starting the engine, and 20 minutes after the engine
start, the ect sensor still indicates below 20 °C (68 ...
Customer problem analysis
Hint:
in troubleshooting, the problem symptoms must be confirmed
accurately, meaning that all preconceptions
must be set aside in order to make an accurate judgement. To ascertain what
the problem symptoms
are, it is extremely important to ask the customer about the problem and
cond ...


