Suspension Control ( Automatic - Electronic Level )

DTC 41 AIR SUS RELAY CIRCUIT

CIRCUIT DESCRIPTION

DTC Detecting Condition:

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.

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.

Wiring Diagram:

Step 1 - 2:

Step 3 - 4:

INSPECTION PROCEDURE

HINT:
- If DTC C1761/61 (ECU malfunction) and/or C1774/74 (power source circuit) is displayed, perform the inspection necessary for DTC C1761/61 and/or C1774/74 first.
(If DTC C1761/61 and C1774/74 are output at the same time, perform the inspection necessary for DTC C1774/74 first.)
- Start the inspection from step 1 when using the hand-held tester, and start from step 2 when not using the hand-held tester.