Brake Lamp: Testing and Inspection
LIGHTING: LIGHTING SYSTEM: Stop Light Circuit
Stop Light Circuit
DESCRIPTION
The rear multiplex network ECU receives stop light switch information from the stop light switch and turns on the stop light.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)
(a) Select the DATA LIST, use the Techstream to generate a control command, and then check that the stop light illuminates.
Body No. 4 (Rear multiplex network ECU)
OK:
Each light illuminates.
OK -- PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT AND HIGH MOUNT STOP LIGHT)
NG -- Continue to next step.
2. INSPECT FUSE (STOP SW)
(a) Remove the STOP SW fuse from the main body ECU RH.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
3. INSPECT STOP LIGHT SWITCH
(a) Inspect the stop light switch Inspection.
OK:
Stop light switch is normal.
NG -- REPLACE STOP LIGHT SWITCH
OK -- Continue to next step.
4. CHECK WIRE HARNESS (ECU - BATTERY)
(a) Disconnect the LC ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT AND HIGH MOUNT STOP LIGHT)
(a) Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the stop light and high mount stop light illuminates.
Body No. 4 (Rear multiplex network ECU)
Result
D -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C -- REPLACE NOISE FILTER
B -- CHECK WIRE HARNESS (REAR MULTIPLEX NETWORK ECU - REAR COMBINATION LIGHT AND BODY GROUND)
A -- Continue to next step.
6. INSPECT FUSE (STOP LP L, STOP LP R)
(a) Remove the STOP LP L and STOP LP R fuses from the rear multiplex network ECU.
(b) Measure the resistance of the fuses.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
7. CHECK WIRE HARNESS (ECU - BATTERY)
(a) Disconnect the LB ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
8. CHECK WIRE HARNESS (REAR MULTIPLEX NETWORK ECU - REAR COMBINATION LIGHT AND BODY GROUND)
(a) Check the wire harness between the rear combination light (stop LH) and rear multiplex network ECU, and the rear combination light (stop LH) and body ground.
(1) Disconnect the LG ECU connector.
(2) Disconnect the X1 light connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:
(4) Connect the LG ECU connector.
(5) Measure the resistance of the wire harness side connector.
Standard resistance:
(b) Check the wire harness between the rear combination light (stop RH) and rear multiplex network ECU, and the rear combination light (stop RH) and body ground.
(1) Disconnect the LG ECU connector.
(2) Disconnect the X3 light connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:
(4) Connect the LG ECU connector.
(5) Measure the resistance of the wire harness side connector.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
9. REPLACE REAR COMBINATION LIGHT (STOP LH OR STOP RH)
(a) Temporarily replace the rear combination light (stop LH or stop RH) with a new or normally functioning one.
(b) Check that the light illuminates.
OK:
Light illuminates.
OK -- END
NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
10. REPLACE NOISE FILTER
(a) Temporarily replace the noise filter with a new or normally functioning one.
(b) Check that the light illuminates.
OK:
Light illuminates.
OK -- END
NG -- Continue to next step.
11. REPLACE CENTER STOP LIGHT
(a) Temporarily replace the center stop light with a new or normally functioning one.
(b) Check that the light illuminates.
OK:
Light illuminates.
OK -- END
NG -- Continue to next step.
12. CHECK WIRE HARNESS (ECU - NOISE FILTER)
(a) Disconnect the LA ECU connector.
(b) Disconnect the V18 noise filter connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
13. CHECK WIRE HARNESS (NOISE FILTER - CENTER STOP LIGHT)
(a) Disconnect the V18 noise filter connector.
(b) Disconnect the V24 light connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
14. CHECK WIRE HARNESS (CENTER STOP LIGHT - BODY GROUND)
(a) Disconnect the V24 light connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE