Up to 08/2009
LIGHTING (EXT): LIGHTING SYSTEM: B2430,B2431: LED Headlight LH Circuit Malfunction
B2431 - LED Headlight RH Circuit Malfunction
DESCRIPTION
These DTCs are stored when the low beam headlights do not illuminate, or a malfunction is detected in the communication between the headlight assembly and the main body ECU (multiplex network body ECU).
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result
C -- INSPECT HEADLIGHT ASSEMBLY
B -- INSPECT POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY)
A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
2. INSPECT POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY)
(a) Remove the power distributor (engine room junction block assembly) from the engine room relay block Components.
(b) Connect a positive (+) lead from the battery to terminal 3A-1
(c) Connect a negative (-) lead from the battery to terminals 3C-13 and 3C-17.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY) Components
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTOR - BATTERY AND BODY GROUND)
(a) Disconnect the 3A power distributor (engine room junction block assembly) connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
(c) Disconnect the 3C power distributor (engine room junction block assembly) connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTOR - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
(a) Disconnect the 3C power distributor (engine room junction block assembly) connector.
(b) Disconnect the 2F instrument panel junction block assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
(a) Remove the instrument panel junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
6. INSPECT HEADLIGHT ASSEMBLY
(a) Disconnect the A85 or A86 headlight assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
LH Side (B2430)
RH Side (B2431)
Text in Illustration
NG -- CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - POWER DISTRIBUTOR)
OK -- Continue to next step.
7. INSPECT HEADLIGHT ASSEMBLY
(a) Disconnect the A85 or A86 headlight assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
LH Side (B2430)
RH Side (B2431)
Text in Illustration
NG -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT ASSEMBLY)
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND)
(a) Disconnect the A85 or A86 headlight assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
LH Side (B2430)
RH Side (B2431)
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
9. REPLACE LIGHT CONTROL ECU
(a) Temporarily replace the headlight control ECU with a new or normally functioning one Components.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B2430 or B2431 is not output.
NG -- REPLACE HEADLIGHT UNIT Components
OK -- END
10. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - POWER DISTRIBUTOR)
(a) Disconnect the 3B power distributor (engine room junction block assembly) connector.
(b) Disconnect the A85 or A86 headlight assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
LH Side (B2430)
RH Side (B2431)
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY) Components
11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT ASSEMBLY)
(a) Disconnect the F14 main body ECU (multiplex network body ECU) connector.
(b) Disconnect the A85 or A86 headlight assembly connector.
(c) Measure the resistance to the according value(s) in the table below.
Standard Resistance:
LH Side (B2430)
RH Side (B2431)
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)