Toyota Corolla Cross: LO-beam Headlight does not Illuminate
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the low beam headlights.
WIRING DIAGRAM
for LED Type Parking Light
for Bulb Type Parking Light
CAUTION / NOTICE / HINT
NOTICE:
- Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*1
for HEV Model: Click here
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for Gasoline Model: Click here
- First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CXPI communication malfunctions before troubleshooting this symptom.
Click here
- First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.
Click here
- Inspect the fuses for circuits related to this system before performing the following procedure.
- *1: w/ Smart Key System
PROCEDURE
|
1. | PERFORM ACTIVE TEST USING GTS |
(a) Enter the following menus: Body Electrical / Main Body / Active Test.
(b) Perform the Active Test according to the display on the GTS.
Body Electrical > Main Body > Active Test|
Tester Display | Measurement Item |
Control Range | Diagnostic Note |
|---|---|---|---|
|
Headlight Relay / Light Power Supply Relay |
Headlights | OFF or ON |
- |
|
Tester Display |
|---|
| Headlight Relay / Light Power Supply Relay |
OK:
Low beam headlights illuminate.
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (LH side low beam light does not illuminate.) (for LED Type Parking Light) |
B |
| NG (RH side low beam light does not illuminate.) (for LED Type Parking Light) |
C |
| NG (LH side low beam light does not illuminate.) (for Bulb Type Parking Light) |
D |
| NG (RH side low beam light does not illuminate.) (for Bulb Type Parking Light) |
E |
| A |
.gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C |
| GO TO STEP 4 |
| D |
| GO TO STEP 6 |
| E |
| GO TO STEP 13 |
|
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| 2. |
INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE) |
(a) Disconnect the A131 headlight assembly LH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A131-2 (LO) - Body ground |
Light control switch in head position |
11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A131-5 (E) - Body ground |
Always | Below 1 Ω |
| OK | | REPLACE HEADLIGHT ASSEMBLY LH |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 4. |
INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE) |
(a) Disconnect the A134 headlight assembly RH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A134-2 (LO) - Body ground |
Light control switch in head position |
11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A134-5 (E) - Body ground |
Always | Below 1 Ω |
| OK | | REPLACE HEADLIGHT ASSEMBLY RH |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 6. |
INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE) |
(a) Disconnect the A131 headlight assembly LH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A131-2 (LO) - Body ground |
Light control switch in head position |
11 to 14 V |
| NG | | GO TO STEP 8 |
|
| 7. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A131-5 (E) - Body ground |
Always | Below 1 Ω |
| OK | | REPLACE HEADLIGHT ASSEMBLY LH |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 8. |
INSPECT H-LP LH RELAY |
Click here
| NG | |
REPLACE H-LP LH RELAY |
|
| 9. |
CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT UNIT ASSEMB LY LH) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
3 (H-LP LH relay) - A131-2 (LO) |
Always | Below 1 Ω |
|
3 (H-LP LH relay) or A131-2 (LO) - Body ground |
Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 10. |
CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - BATTERY) |
| (a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
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| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 11. |
CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - POWER DISTRIBUTION BOX ASSEMBLY) |
(a) Disconnect the 8E power distribution box assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
1 (H-LP LH relay) - 8E-6 |
Always | Below 1 Ω |
|
1 (H-LP LH relay) or 8E-6 - Body ground |
Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 12. |
CHECK POWER DISTRIBUTION BOX ASSEMBLY |
(a) Remove the power distribution box assembly.
Click here
(b) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.
|
*a | Component without harness connected (Power Distribution Box Assembly) |
- | - |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
8E-6 - MB-6 (HRLY) | Always |
Below 1 Ω |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
| 13. |
INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE) |
(a) Disconnect the A134 headlight assembly RH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A134-2 (LO) - Body ground |
Light control switch in head position |
Below 1 V |
| NG | | GO TO STEP 15 |
|
| 14. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A134-5 (E) - Body ground |
Always | Below 1 Ω |
| OK | | REPLACE HEADLIGHT ASSEMBLY RH |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 15. |
INSPECT H-LP RH RELAY |
Click here
| NG | |
REPLACE H-LP RH RELAY |
|
| 16. |
CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT UNIT ASSEMBLY RH) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
3 (H-LP RH relay) - A134-2 (LO) |
Always | Below 1 Ω |
|
3 (H-LP RH relay) or A134-2 (LO) - Body ground |
Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 17. |
CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - BATTERY) |
| (a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 18. |
CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - POWER DISTRIBUTION BOX ASSEMBLY) |
(a) Disconnect the 8E power distribution box assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
1 (H-LP RH relay) - 8E-10 |
Always | Below 1 Ω |
|
1 (H-LP RH relay) or 8E-10 - Body ground |
Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 19. |
CHECK POWER DISTRIBUTION BOX ASSEMBLY |
(a) Remove the power distribution box assembly.
Click here
(b) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.
|
*a | Component without harness connected (Power Distribution Box Assembly) |
- | - |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
8E-10 - MB-9 (HRY2) | Always |
Below 1 Ω |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
READ NEXT:
Taillight Relay Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the taillight and license plate light. WIRING DIAGRAM
for LED Type Parking Light
for Bulb Type Parking Light
CAUTION / NOTIC
High Beam Headlight Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the high beam headlights. WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network
SEE MORE:
Precaution
PRECAUTION
PRECAUTION
NOTICE:
If Continuously Variable Transaxle (CVT) parts are replaced, perform the
following as necessary: Parts Replacement Compensation Table
*1: When replacing with a new TCM
*2: When replacing with a TCM which was installed to another vehicle
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) (P012800,P012807)
DESCRIPTION The ECM uses the engine coolant temperature sensor, installed to the water outlet, to monitor the operation of the thermostat.
DTC No. Detection Item
DTC Detection Condition Trouble Area
MIL Note
P012800 Coolant Thermostat (Coolant Temperature Below Thermo
