DTC Code | DTC Name |
---|---|
C1A05 | Stop Light Switch Circuit |
DESCRIPTION
When the brake pedal is depressed, the stop light switch assembly sends a brake pedal operation signal to the driving support ECU assembly. After receiving this signal, the driving support ECU cancels the dynamic radar cruise control system. When the driving support ECU assembly detects a problem in the stop light switch assembly circuit, DTC C1A05 is stored.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
---|---|---|---|
C1A05 | Stop Light Switch Circuit | When the engine switch is on (IG) and the cruise control switch is on, the driving support ECU assembly detects a malfunction in the signal from the stop light switch assembly circuit for 2 seconds or more. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)
*a | Front view of wire harness connector (to Stop Light Switch Assembly) |
Disconnect the A52 stop light switch assembly connector.
Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY AND BODY GROUND) |
OK |
CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)
Disconnect the Q1 driving support ECU assembly connector.
Disconnect the A52 stop light switch assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
REPLACE STOP LIGHT SWITCH ASSEMBLY
Replace the stop light switch assembly.
Result | ||
---|---|---|
|
NEXT |
CHECK FOR DTCs (RADAR CRUISE)
Clear the DTCs.
Make sure that the DTC detection conditions are met.
Tech Tips
If the detection conditions are not met, the system cannot detect the malfunction.
Check for DTCs.
Note
When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.
Result | ||||||
---|---|---|---|---|---|---|
|
A |
END (STOP LIGHT SWITCH ASSEMBLY WAS DEFECTIVE) |
B |
REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here |