DESCRIPTION
The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
PERFORM ACTIVE TEST USING GTS
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Body Electrical / Main Body / Active Test.
Check that the relay operates.
Tester Display | Measurement Item | Control Range | Diagnostic Note |
---|---|---|---|
Taillight Relay | Taillight relay | ON/OFF | - |
Tester Display |
---|
Taillight Relay |
OK |
---|
Taillight relay operates. (Taillights illuminate.) |
Result | |||
---|---|---|---|
|
OK |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here |
NG |
CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
Disconnect the 3B instrument panel junction block assembly connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
Remove the instrument panel junction block assembly.
for LHD: Click here
for RHD: Click here
Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
*a | Component without harness connected (Instrument Panel Junction Block Assembly) |
- | - |
Connect a positive (+) lead from the auxiliary battery to terminal 3B-1.
Connect a negative (-) lead from the auxiliary battery to terminal MB-14 (TRLY).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here |
NG |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here |