DESCRIPTION
When the ignition switch is ON or the operation conditions of the headlights are met, the main body ECU (multiplex network body ECU) supplies power to the headlight ECU sub-assemblies via the No. 1 integration relay.
When the ignition switch is ON, the main body ECU (multiplex network body ECU) supplies power to the headlight ECU sub-assemblies via the IG1-NO. 1 relay.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY - POWER SOURCE AND BODY GROUND) |
(a) Disconnect the A16 headlight ECU sub-assembly LH connector.
(b) Disconnect the A17 headlight ECU sub-assembly RH connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Headlight ECU Sub-assembly LH
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
A16-13 (ECUB) - Body ground |
Ignition switch ON |
11 to 14 V |
A16-4 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
A17-13 (ECUB) - Body ground |
Ignition switch ON |
11 to 14 V |
A17-4 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Headlight ECU Sub-assembly LH
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A16-12 (GND) - Body ground |
Always |
Below 1 Ω |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A17-12 (GND) - Body ground |
Always |
Below 1 Ω |
Result |
Proceed to |
---|---|
OK |
A |
NG (Headlight ECU Sub-assembly LH) |
B |
NG (Headlight ECU Sub-assembly RH) |
C |
A | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
C | ![]() |
GO TO STEP 6 |
|
2. |
INSPECT NO. 1 INTEGRATION RELAY (H-LP LH RELAY) |
(a) Remove the No. 1 integration relay from the No. 1 engine room relay block.
Click here
(b) Inspect the No. 1 integration relay.
Click here
OK:
No. 1 integration relay is normal.
NG | ![]() |
REPLACE NO. 1 INTEGRATION RELAY |
|
3. |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY (H-LP LH RELAY) - BATTERY) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1A-5 - Body ground |
Always |
11 to 14 V |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 3F instrument panel junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1B-2 - 3F-31 |
Always |
Below 1 Ω |
1B-2 or 3F-31 - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the instrument panel junction block assembly.
Click here
(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
(c) Measure the resistance according to the value(s) in the table below.
*a |
Component without harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3F-31 - MB-15 (HRLY) |
Always |
Below 1 Ω |
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
NG | ![]() |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
6. |
INSPECT NO. 1 INTEGRATION RELAY (H-LP RH RELAY) |
(a) Remove the No. 1 integration relay from the No. 1 engine room relay block.
Click here
(b) Inspect the No. 1 integration relay.
Click here
OK:
No. 1 integration relay is normal.
NG | ![]() |
REPLACE NO. 1 INTEGRATION RELAY |
|
7. |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY (H-LP RH RELAY) - BATTERY) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1B-8 - Body ground |
Always |
11 to 14 V |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Disconnect the F15 main body ECU (multiplex network body ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1A-11 - F15-1 (DIM) |
Always |
Below 1 Ω |
1A-11 or F15-1 (DIM) - Body ground |
Always |
10 kΩ or higher |
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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