LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> LX 470 >> Repair and Diagnosis >> Suspension >> Suspension Control Systems >> Suspension Control >> Active Height Control Suspension >> Diagnostic Trouble Code Chart
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Trouble Code Chart

HINT:

DIAGNOSTIC TROUBLE CODE REFERENCE

DTC No. Detection Item Trouble Area
C1711/11  Front Height Control Sensor RH Circuit Malfunction
  • Front height control sensor RH
  • Suspension control ECU
  • Wire harness
C1712/12  Front Height Control Sensor LH Circuit Malfunction
  • Front height control sensor LH
  • Suspension control ECU
  • Wire harness
C1713/13  Rear Height Control Sensor Circuit Malfunction
  • Rear height control sensor
  • Suspension control ECU
  • Wire harness
C1718/18  Pressure Sensor Circuit Malfunction
  • Fluid pressure sensor
  • Suspension control ECU
  • Wire harness
C1719/19  Oil Temperature Sensor Circuit Malfunction
  • Fluid temperature sensor
  • Suspension control ECU
  • Wire harness
C1721/21  Front Damping Force Control Actuator Circuit Malfunction
  • Front damping force control actuator
  • Suspension control ECU
  • Wire harness
C1723/23  Rear Damping Force Control Actuator Circuit Malfunction
  • Rear damping force control actuator
  • Suspension control ECU
  • Wire harness
C1731/31  Front Height Control Gate Solenoid Valve Circuit Malfunction
  • Front gate valve solenoid
  • Suspension control ECU
  • Wire harness
C1732/32  Front Height Control Leveling Solenoid Valve Circuit Malfunction
  • Front leveling valve solenoid
  • Suspension control ECU
  • Wire harness
C1733/33  Rear Height Control Gate Solenoid Valve Circuit Malfunction
  • Rear gate valve solenoid
  • Suspension control ECU
  • Wire harness
C1734/34  Rear Height Control Leveling Solenoid Valve Circuit Malfunction
  • Rear leveling valve solenoid
  • Suspension control ECU
  • Wire harness
C1736/36  Accumulator Solenoid Valve Circuit Malfunction
  • Accumulator solenoid
  • Suspension control ECU
  • Wire harness
C1741/41  Compressor Relay Coil Malfunction
  • AHC motor relay
  • Suspension control ECU
  • Wire harness
C1743/43  Height Control Main Relay Malfunction
  • AHC main relay
  • Suspension control ECU
  • Wire harness
C1751/51  Continuous Electric Current to Height Control Compressor
  • AHC pump and motor
  • AHC motor relay
  • Height control sensor link comes off
  • Fluid leakage from the fluid line or each solenoid valve
  • Fluid clog in the fluid line or each solenoid valve
  • Torsion bar spring
  • Suspension control ECU
  • Wire harness
C1761/61  ECU Malfunction
  • ECU internal memory error
  • Suspension control ECU
C1762/62  Abnormal Oil Pressure for Pump
  • AHC pump and motor
  • Fluid pressure sensor
  • AHC motor relay
  • Fluid empty
  • Suspension control ECU
  • Wire harness
C1763/63  Abnormal Oil Pressure due to not Opening Leveling Valve
  • Control valve assembly
  • Fluid pressure sensor
  • Fluid clog in the fluid line or each solenoid valve
  • Suspension control ECU
  • Wire harness
C1764/64  Abnormal Oil Pressure due to not Opening Accumulator Valve
  • Height control accumulator
  • Fluid pressure sensor
  • Fluid clog in the fluid line or each solenoid valve
  • Suspension control ECU
  • Wire harness
C1776/76  Speed Sensor Circuit
  • Front speed sensor circuit
  • Front height control sensor RH
  • Front height control sensor LH
  • Rear height control sensor
  • Suspension control ECU
  • Wire harness
C1781/81  Steering Angle Sensor Circuit
  • Steering angle sensor
  • Suspension control ECU
  • Wire harness
C1782/82  Stop Light Switch Circuit
  • Stop light switch
  • Suspension control ECU
  • Wire harness
C1783/83  Door Courtesy Switch Circuit
  • Door courtesy switch
  • Instrument ECU
  • Suspension control ECU
  • Wire harness
C1786/86  Height Control Switch Circuit
  • Suspension control switch (height select switch)
  • Suspension control ECU
  • Wire harness
C1787/87  Absorber Control Switch Circuit
  • Suspension control switch (damping mode select switch)
  • Suspension control ECU
  • Wire harness
C1788/88  Height Control OFF Switch Circuit
  • Suspension control switch (height control switch)
  • Suspension control ECU
  • Wire harness
C1789/89  L4 Switch Circuit Malfunction
  • L4 position switch
  • Suspension control ECU
  • Wire harness
C1794/94  Front Speed Sensor RH Circuit Malfunction
  • Front speed sensor RH
  • Skid control ECU
  • Suspension control ECU
  • Wire harness
C1795/95  Front Speed Sensor LH Circuit Malfunction
  • Front speed sensor LH
  • Skid control ECU
  • Suspension control ECU
  • Wire harness
C1796/96  Differential Lock Detect Signal Circuit Malfunction
  • Center differential lock position switch
  • Suspension control ECU
  • Wire harness