Compressor Motor, Compressor Motor Relay and Circuit Inspection

INSPECTION PROCEDURE

1. SELF-DIAGNOSIS RESULT CHECK 

   Check self-diagnosis results.

   COMPRESSOR MOTOR, COMPRESSOR MOTOR RELAY AND CIRCUIT - SELF-DIAGNOSIS RESULTS
   
   

   Self-diagnosis results
   C1802
   C1804
   C1808

   Is the above displayed in the self-diagnosis display items? 

   1. YES: If code C1802 was retrieved during self-diagnosis, GO TO 3. If code C1804 or C1808 was retrieved during self-diagnosis, GO TO 2.
   2. NO: Inspection End.
2. CHECK SYSTEM OPERATION 
   1. Load vehicle to standard laden condition (with driver, front passenger, 2 passengers in second row seats and no cargo).
   2. Conduct active test of "EXHAUST SOLENOID" to lower vehicle ride height to -20mm.
   3. Return the rear load leveling air suspension system to normal operating mode.
   4. Check self-diagnostic results.

      Is code C1804 or C1808 displayed again? 

   1. YES: GO TO 3.
   2. NO: Inspection End.
3. CONNECTOR INSPECTION 
   1. Disconnect suspension control unit connector B3 and suspension air compressor C9.
   2. Check the terminals for deformation, disconnection, looseness or damage.

   OK or NG 

   1. OK: If code C1804 or C1808 was retrieved during self-diagnosis, GO TO 4. If code C1802 was retrieved during self-diagnosis, GO TO 6
   2. NG: Repair or replace as necessary.
4. AIR HOSE INSPECTION 

   Inspect for pinched or damaged air hoses between the suspension air reservoir and each load leveling rear air suspension shock absorber.

   OK or NG 

   1. OK: GO TO 5.
   2. NG: Repair or replace as necessary.
5. SUSPENSION AIR COMPRESSOR INSPECTION 

   Apply 12V to suspension air compressor C9 terminal 2 and body ground to suspension air compressor C9 terminal 1.

   System air pressure should vent. 

   OK or NG 

   1. OK: GO TO 6.
   2. NG: Replace the suspension air compressor. Refer to "CONTROL UNIT ".
      Fig 1: Applying 12V To Suspension Air Compressor C9 Terminal 2 And Body Ground To Suspension Air Compressor C9 Terminal 1

      Courtesy of NISSAN MOTOR CO., U.S.A.
   3. CHECK SUSPENSION AIR COMPRESSOR POWER AND GROUND 
      1. Turn the ignition switch ON.
      2. Check voltage between suspension air compressor connector C9 terminal 2 (SB) and ground.
         1. Voltage: Approx. 12V 
         Fig 2: Checking Voltage Between Suspension Air Compressor Connector C9 Terminal 2 (SB) And Ground

         Courtesy of NISSAN MOTOR CO., U.S.A.
      3. Check resistance between suspension air compressor connector C9 terminal 1 (B) and ground.
         1. Continuity should exist. 

      OK or NG 

      1. OK: Replace the suspension control unit. Refer to "CONTROL UNIT ".
      2. NG: Repair the circuit.
         Fig 3: Checking Resistance Between Suspension Air Compressor Connector C9 Terminal 1 (B) And Ground

         Courtesy of NISSAN MOTOR CO., U.S.A.