Lexus ES: Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure (C1A8C46,C1A8D1C,C1A9000,C1A9100)
DESCRIPTION
When an internal malfunction is detected in the millimeter wave radar sensor assembly, a DTC is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A8C46 | Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure | When the engine switch is on (IG), the millimeter wave radar sensor assembly detects an internal memory malfunction | Millimeter wave radar sensor assembly |
| C1A8D1C | Power Supply Circuit in Front Radar Sensor Circuit Voltage Out of Range | When the engine switch is on (IG), the millimeter wave radar sensor assembly detects a power source circuit malfunction | Millimeter wave radar sensor assembly |
| C1A9000 | Malfunction of Millimeter-wave Circuit in Front Radar Sensor | When the engine switch is on (IG), the millimeter wave radar sensor assembly detects an internal millimeter wave circuit malfunction | Millimeter wave radar sensor assembly |
| C1A9100 | Malfunction of Acceleration Sensor in Front Radar Sensor | When the engine switch is on (IG), the millimeter wave radar sensor assembly detects an internal acceleration sensor malfunction | Millimeter wave radar sensor assembly |
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle and a DTC may be stored.
-
When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the millimeter wave radar sensor beam axis must be performed.
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PROCEDURE
| 1. | REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Replace the millimeter wave radar sensor assembly with a new one.
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Components
COMPONENTS ILLUSTRATION *1 COURTESY LIGHT ASSEMBLY *2 REAR DOOR TRIM BOARD SUB-ASSEMBLY *3 REAR DOOR UPPER TRIM PAD *4 REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY WITH REAR DOOR UPPER ARMREST BASE PANEL ILLUSTRATION *A w/ Rear Door Sunshade - - *1 CURTAIN HOOK
Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE FRONT DRIVE SHAFT OIL SEAL RH (a) Hold the differential case assembly in a vise between aluminum plates. NOTICE: Do not overtighten the vise. (b) Using SST, remove the front drive shaft oil seal RH from the differential case assembly. SST: 09308-00010 N
