Lexus ES: Stop Light Relay Circuit (C1A4B)
DESCRIPTION
When a stop light relay circuit malfunction signal sent from the electronically controlled brake system is detected by the clearance warning ECU assembly, DTC C1A4B is stored.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
C1A4B | Stop Light Relay Circuit | Stop light relay circuit malfunction | Electronically controlled brake system |
CAUTION / NOTICE / HINT
PROCEDURE
(a) Using the Techstream, check for DTCs according to the prompts on the screen.
HINT:
After turning the power switch from off to on (IG), wait 4 seconds or more before checking for DTCs.
Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes
(b) Clear the DTCs according to the screen on the Techstream.
Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs
(c) Recheck for DTCs.
Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes
HINT:
-
DTC C1A4B is stored when a malfunction signal sent from the electronically controlled brake system is detected.
-
If the malfunctioning part has been repaired or replaced before rechecking for DTCs, DTC C1A4B will not be output again.
-
If DTC C1A4B is output frequently, duplicate the conditions that cause the problem symptoms and perform troubleshooting again, even though the DTC was not output when rechecking for DTCs.
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Result | Proceed to |
DTC C1A4B is output | A |
DTC C1A4B is not output | B |
B | | USE SIMULATION METHOD TO CHECK |
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SEE MORE:
COMPONENTS ILLUSTRATION *A w/o Manual (SOS) Switch *B w/ Manual (SOS) Switch *1 ANTENNA CORD SUB-ASSEMBLY *2 NO. 2 SIDE DEFROSTER NOZZLE DUCT *3 NO. 3 HEATER TO REGISTER DUCT - - ILLUSTRATION *A for Moon Roof - - *1 NO. 2 ANTENNA CORD SUB-ASSEMBLY -
DESCRIPTION The steering sensor receives the following switch information:
Light control switch in DRL OFF*1, off*2, tail, head or AUTO position
Dimmer switch in high, low or high flash (pass) position
*1: w/ DRL OFF Switch
*2: w/o DRL OFF Switch
WIRING DIAGRAM CAUTION / NOTICE / HI
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