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Home >> Infiniti >> 2004 >> Q45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P1805: Brake Switch >> Diagnostic Procedure >> 2. Check Stop Lamp Switch Power Supply Circuit
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2. Check Stop Lamp Switch Power Supply Circuit

  1. Disconnect stop lamp switch harness connector.
    Fig 1: Locating Stop Lamp Switch
    G00761262Courtesy of NISSAN MOTOR CO., U.S.A.
  2. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.
    1. Voltage: Battery voltage 
Fig 2: Checking voltage between stop lamp switch terminal 1 & ground
G00761263Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO 4.

NG: GO TO 3.