Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2009 Lexus GS 450hFACTORY OEM SERVICE PROCEDURE
Dynamic Radar Cruise Control System
DYNAMIC RADAR CRUISE CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| P0500 | Vehicle Speed Sensor Malfunction |
| P0571 | Brake Switch "A" Circuit |
| P0607 | Control Module Performance |
| P1570 | Radar Sensor Malfunction |
| P1572 | Improper Aiming of Radar Sensor Beam Axis |
| P1575 | Warning Buzzer Malfunction |
| P1578 | Brake System Malfunction |
| P1615 | Communication Error from Distance Control ECU to HV ECU |
| P1616 | Communication Error from HV ECU to Distance Control ECU |
| P1617 | Distance Control ECU Malfunction |
| P1630 | Communication Error from Skid Control ECU to HV ECU |
| P1631 | Communication Error from HV ECU to Skid Control ECU |
| U0122-732 | Lost Communication with HV ECU |
| U0123-736 | Lost Communication with Yaw Rate Sensor |
| U0126-735 | Lost Communication with Steering Angle Sensor Module |
| U0235-737 | Communication Error from Radar Sensor to Distance Control ECU |
| U0293-730 | Lost Communication with Distance Control ECU |
| U0293-733 | Lost Communication with Skid Control ECU |
| U1101-728 | Lost Communication with HV ECU |
| U1102-738 | Communication Error from Distance Control ECU to Radar Sensor |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.