Stop Light Circuit
LIGHTING: LIGHTING SYSTEM: Stop Light Circuit
- Stop Light Circuit
DESCRIPTION
The multiplex network rear ECU receives stop light switch information from the stop light switch and turns on the stop light.
WIRING DIAGRAM
PROCEDURE
1. READ VALUE USING TECHSTREAM
(a) Select the DATA LIST, use the Techstream to generate a control command, and then check that the stop light illuminates.
Body No. 4 (Multiplex network rear ECU)
OK:
Each light illuminates.
OK -- PERFORM ACTIVE TEST USING TECHSTREAM
NG -- Continue to next step.
2. INSPECT FUSE (STOP SW)
(a) Remove the STOP SW fuse from the cowl side junction block 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
Inspection Inspection
OK:
Stop light switch is normal.
NG -- REPLACE STOP LIGHT SWITCH
OK -- Continue to next step.
4. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - BATTERY)
(a) Disconnect the LC junction block connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
5. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the stop light illuminates.
Body No. 4 (Multiplex network rear ECU)
Result:
D -- REPLACE NOISE FILTER
C -- CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - LIGHT (STOP LH OR STOP RH) - BODY GROUND)
B -- INSPECT FUSE (STOP LP L, STOP LP R)
A -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
6. INSPECT FUSE (STOP LP L, STOP LP R)
(a) Remove the STOP LP L fuse from the No. 1 junction block.
(b) Remove the STOP LP R fuse from the No. 1 junction block.
(c) Measure the resistance of the fuses.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
7. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - BATTERY)
(a) Disconnect the LB junction block connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
8. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - LIGHT (STOP LH OR STOP RH) - BODY GROUND)
(a) Check the wire harness between the rear combination light (stop LH) and No. 1 junction block, and the rear combination light (stop LH) and body ground.
(1) Disconnect the LG junction block connector.
(2) Disconnect the X1 light connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:
(4) Connect the LG junction block 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 No. 1 junction block, and the rear combination light (stop RH) and body ground.
(1) Disconnect the LG junction block connector.
(2) Disconnect the X3 light connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:
(4) Connect the LG junction block connector.
(5) Measure the resistance of the wire harness side connector.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS AND 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 (NO. 1 JUNCTION BLOCK - NOISE FILTER)
(a) Disconnect the LA junction block 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 AND 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 AND 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 AND CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE