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Home >> Lexus >> 2003 >> GX 470 >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Electronic Modulated Suspension & Rear Air Suspension System - Diagnosis >> DTC C1741/41: Air Sus Relay Circuit >> Circuit Description

Circuit Description

When "UP" side of the height control switch is pressed, a signal is sent from terminal RC of the suspension control ECU to the AIR SUS relay to turn it on.

As a result, the current flows to the AIR SUS relay coil, closing the relay contact, and then the battery positive voltage is applied to the compressor, which causes the compressed air to raise the vehicle height.

DTC

DTC No. DTC Detecting Condition Trouble Area
C1741/41 Either the condition 1. or 2. is detected.
  1. With the AIR SUS relay inactivated, an open signal of the AIR SUS relay is detected for 1 sec. or more.
  2. With the AIR SUS relay activated, a short signal of the AIR SUS relay is detected 8 times successively.
  • AIR SUS relay
  • AIR SUS relay circuit
  • Suspension control ECU

HINT:

Once ECU stores DTC C1741/41 in the memory, the vehicle height control is suspended until a normal signal is input to ECU from the AIR SUS relay. However, the control resumes if the ignition switch is once turned OFF, and then turned ON again.

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