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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Altima. 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 auto amp. as a result of conducting Self-diagnosis   STEP 2.)

Fig 1: Identifying Sunload Sensor Circuit Terminals
G01995738Courtesy of NISSAN MOTOR CO., U.S.A.
  1. CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND BODY GROUND 

    Disconnect sunload sensor harness connector.

    Fig 2: Sunload Sensor Harness Connector Voltage Chart
    G01995739Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 2.
    2. NG: GO TO  4.
      Fig 3: Checking Voltage Between Sunload Sensor & Body Ground Terminals
      G01995740Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK SUNLOAD SENSOR GROUND CIRCUIT BETWEEN SUNLOAD SENSOR AND AUTO AMP. (LCU) 

    Disconnect auto amp. (LCU) harness connector.

    Fig 4: Auto Amp. (LCU) Harness Connector Continuity Chart
    G01995741Courtesy of NISSAN MOTOR CO., U.S.A.

    If OK, check harness for short.

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair harness or connector.
      Fig 5: Checking Continuity Between Sunload Sensor & Auto Amp. (LCU) Connector Terminals
      G01995742Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK SUNLOAD SENSOR 

    Refer to SUNLOAD SENSOR .

    OK or NG 

    1. OK:
      1. Replace auto amp. (LCU).
      2. Go to self-diagnosis step-by-step procedure (Refer to SELF-DIAGNOSIS) and perform self-diagnosis   STEP 2. Confirm that code No. 20 is displayed.
    2. NG:
      1. Replace sunload sensor.
      2. Go to self-diagnosis step-by-step procedure (Refer to SELF-DIAGNOSIS) and perform self-diagnosis   STEP 2. Confirm that code No. 20 is displayed.
  4. CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND AUTO AMP. (LCU) 

    Disconnect auto amp. (LCU) harness connector.

    Fig 6: Auto Amp. (LCU) Harness Connector Continuity Chart
    G01995743Courtesy of NISSAN MOTOR CO., U.S.A.

    If OK, check harness for short.

    OK or NG 

    1. OK:
      1. Replace auto amp.
      2. Go to self-diagnosis step-by-step procedure (Refer to SELF-DIAGNOSIS) and perform Self-Diagnosis   STEP 2. Confirm that code No. 20 is displayed.
        Fig 7: Checking Continuity Between Sunload Sensor & Auto Amp. (LCU) Terminals
        G01995744Courtesy of NISSAN MOTOR CO., U.S.A.
    2. NG: Repair harness or connector.
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