Diagnostic Procedure For SUNLOAD Sensor

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Sunload sensor circuit is open or shorted. (25 or -25 is indicated on unified meter and A/C amp. as a result of performing Self-diagnosis STEP-2.)

Fig 1: Sunload Sensor Circuit

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

CHECK VOLTAGE BETWEEN SUNLOAD SENSOR AND GROUND
1. Disconnect sunload sensor connector.
2. Turn ignition switch ON.
3. Check voltage between sunload sensor harness connector M87 terminal 1 (LG) and ground.
  1. 1 - Ground: Approx. 5V
Fig 2: Checking Voltage Between Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 2.
2. NG: GO TO 4.
CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between sunload sensor harness connector M87 terminal 2 (W/G) and unified meter and A/C amp. harness connector M57 terminal 49 (W/G).
  1. 2-49: Continuity should exist.
OK or NG
1. OK: GO TO 3.
2. NG: Repair harness or connector.
Fig 3: Checking Continuity Between Terminal 2 And Terminal 49
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK SUNLOAD SENSOR
Refer to "SUNLOAD SENSOR ".

OK or NG
1. OK :
  1. Replace unified meter and A/C amp.
  2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
2. NG :
  1. Replace sunload sensor.
  2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between sunload sensor harness connector M87 terminal 1 (LG) and unified meter and A/C amp. harness connector M57 terminal 50 (LG).
  1. 1-50: Continuity should exist.
4. Check continuity between sunload sensor harness connector M87 terminal 1 (LG) and ground.
  1. 1 - Ground: Continuity should not exist.
Fig 4: Checking Continuity Between Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK :
  1. Replace unified meter and A/C amp.
  2. Go to self-diagnosis "FUNCTION CONFIRMATION PROCEDURE " and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
2. NG: Repair harness or connector.