Diagnostic Procedure

WARNING: This page is about a different car, the 2003 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: Sunload Sensor Circuit Diagnostic Procedure

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

CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND BODY GROUND
Disconnect sunload sensor harness connector.

Fig 2: Checking Sunload Sensor Circuit Between Sunload Sensor And Body Ground (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Checking Sunload Sensor Circuit Between Sunload Sensor And Body Ground (2 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 2.
2. NG: GO TO 4.
CHECK SUNLOAD SENSOR GROUND CIRCUIT BETWEEN SUNLOAD SENSOR AND AUTO AMP. (LCU)
Disconnect auto amp. (LCU) harness connector.

Fig 4: Checking Sunload Sensor Ground Circuit Between Sunload Sensor And Auto Amp. (LCU) (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: Checking Sunload Sensor Ground Circuit Between Sunload Sensor And Auto Amp. (LCU) (2 Of 2)
Courtesy 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.
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.
CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND AUTO AMP. (LCU)
Disconnect auto amp. (LCU) harness connector.

Fig 6: Checking Sunload Sensor Circuit Between Sunload Sensor And Auto Amp. (LCU) (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 7: Checking Sunload Sensor Circuit Between Sunload Sensor And Auto Amp. (LCU) (2 Of 2)
Courtesy 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.
2. NG: Repair harness or connector.