DESCRIPTION
The main body ECU (driver side junction block assembly) controls the headlight relays.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Active Test.
(e) Check that the relays operate.
Main Body
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Headlight Relay |
Headlight Relay |
ON/OFF |
- |
OK:
Headlight relays operate. (Low beam headlights illuminate.)
OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
2. |
INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY |
(a) Remove the power distributor (engine room junction block assembly)
from the engine room relay block (See page
|
|
(b) Connect a positive (+) lead from the battery to terminal 1A-1.
(c) Connect a negative (-) lead from the battery to terminal 1F-17.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1D-1 - Battery negative |
Always |
11 to 14 V |
1D-2 - Battery negative |
Always |
11 to 14 V |
*1 |
Component without harness connected (Power Distributor (Engine Room Junction Block Assembly)) |
NG | ![]() |
REPLACE POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY) |
|
3. |
CHECK HARNESS AND CONNECTOR (BATTERY - ENGINE ROOM JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 1A power distributor (engine room junction block assembly) connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connector |
Condition |
Specified Condition |
---|---|---|
1A-1 - Body ground |
Always |
11 to 14 V |
*1 |
Front view of wire harness connector (to Power Distributor (Engine Room Junction Block Assembly)) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - MAIN BODY ECU) |
(a) Disconnect the 1F power distributor (engine room junction block assembly) connector. |
|
(b) Disconnect the 2G main body ECU (driver side junction block assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1F-17 - 2G-35 |
Always |
Below 1 Ω |
1F-17 - Body ground |
Always |
10 kΩ or higher |
*1 |
Front view of wire harness connector (to Power Distributor (Engine Room Junction Block Assembly)) |
*2 |
Front view of wire harness connector (to Main Body ECU (Driver Side Junction Block Assembly)) |
OK | ![]() |
REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) |
NG | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
Seat Heater System
Precaution
PRECAUTION
1. NOTICE FOR INITIALIZATION
HINT:
When disconnecting the cable from the negative (-) battery terminal, initialize
the following systems after the cable is reconnected.
System Name
See procedure
...
Registration
REGISTRATION
PROCEDURE
1. DESCRIPTION OF CODE REGISTRATION
It is necessary to register the transmitter IDs in the tire pressure warning
ECU when replacing a tire pressure warning valve and transmitter and/or a tire pressure
warning ECU.
Prepare all tra ...
On-vehicle Inspection
ON-VEHICLE INSPECTION
CAUTION / NOTICE / HINT
CAUTION:
Be sure to follow the correct removal and installation procedures of the steering
pad.
PROCEDURE
1. INSPECT STEERING PAD (Vehicle not Involved in Collision)
(a) Perform a diagnostic system check (S ...