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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 551 (Sonar System) >> Symptom Diagnosis >> Sonar System Symptoms >> Symptom Table

Symptom Table

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Always perform Preliminary Check and Self-Diagnosis Function before diagnosing vehicle by symptom. Refer to Preliminary Check  and CONSULT Function .
  • If the front license plate is bent and not laying flat against the bumper, it can cause a false warning from the sonar system. Before performing diagnosis for a false warning, ensure that the front license plate is laying flat against the bumper and no other obstructions are within the detection range of the sonar sensors.

Symptom

Repair order

When the transmission gear selector lever is in the R position and the sonar system is ON, the rear sonar system does not operate.
  1. Check sonar control unit power and ground circuits. Refer to Diagnosis Procedure .
  2. Check transmission range switch. Refer to Diagnosis Procedure .
  3. Check back-up lamp relay.
  4. Check related harness and connections for back-up lamp relay.
  5. Check rear sonar sensors. Refer to Component Function Check .
  6. Replace sonar control unit. Refer to Removal and Installation .

When the transmission gear selector lever is in a forward drive gear and the sonar system is ON, the front sonar system does not operate. (with front and rear sonar system)
  1. Check sonar control unit power and ground circuits. Refer to Diagnosis Procedure .
  2. Check the transmission range switch. Refer to Diagnosis Procedure .
  3. Check back-up lamp relay.
  4. Check A/T shift selector (park position switch) circuit.
  5. Check front sonar sensors. Refer to Component Function Check .
  6. Replace sonar control unit. Refer to Removal and Installation .

Buzzer sounds although there are no obstacles within the detection range (false detection).
  1. Check all sonar sensors for misalignment or damage (including bumper and fascia). Refer to Removal and Installation  (front sonar sensors) or Removal and Installation  (rear sonar sensors).
  2. Check all sonar sensors for dirt or ice buildup. Refer to Preliminary Check .
  3. Check sonar sensors. Refer to Component Function Check .
  4. Replace sonar control unit. Refer to Removal and Installation .

The sonar system still operates when the sonar system OFF indicator lamp is ON.
  1. Check sonar system OFF indicator lamp. Refer to Component Inspection .
  2. Replace sonar control unit. Refer to Removal and Installation .

The sonar sensors do not detect objects within the detectable range (intermittent operation).
  1. Check sonar sensors. Refer to Preliminary Check  and Component Inspection .
  2. Replace sonar control unit. Refer to Removal and Installation .

When the sonar system is OFF, the OFF indicator does not light and the sonar buzzer does not sound.
  1. Check sonar system OFF switch. Refer to Component Inspection .
  2. Check harness and connections for sonar system OFF switch. Refer to Diagnosis Procedure .
  3. Replace sonar control unit. Refer to Removal and Installation .

When the sonar system is OFF, the OFF indicator lamp does not light but the sonar buzzer does sound.
  1. Check sonar system OFF indicator lamp. Refer to Component Inspection .
  2. Check harness and connections for sonar system OFF indicator lamp. Refer to Diagnosis Procedure .
  3. Replace sonar control unit. Refer to Removal and Installation .
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