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Home › Infiniti › 2003 › I35 › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P1564: ASCD Steering Switch › Diagnostic Procedure

Diagnostic Procedure

  1. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step  3 .
  2. Turn ignition on. Select MAIN SW, RESUME/ACC SW, SET SW and CANCEL SW in DATA MONITOR mode with CONSULT-II. CONSULT-II should indicate ON for each button when it is pressed. CONSULT-II should indicate OFF when every button is released. If operation is as specified, go to step  6 . If operation is not as specified, go to step  4 .
  3. Turn ignition on. Measure voltage between ground and ECM terminal No. 50 (Green/Yellow wire) by backprobing. See Figure and Figure . Voltage should be as follows:
    • When every button is released, voltage should be about 4 volts.
    • When CRUISE switch is pressed, voltage should be about .5 volt.
    • When COAST/SET switch is pressed, voltage should be about 2 volts.
    • When ACCEL/RES switch is pressed, voltage should be about 3 volts.
    • When CANCEL switch is pressed, voltage should be about one volt.
    If voltage is as specified, go to step  6 . If voltage is not as specified, go to next step.
  4. Turn ignition off. Disconnect ASCD steering switch harness connector. Check continuity between ground and ASCD switch harness connector terminal No. 2. See Fig 1 . Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step  6 .
  5. Check the following:
    • Check for poor connection at White, 18-pin connector F53 terminal No. 9 (Black wire). See Figure . Connector is located near ECM. See Figure .
    • Check combination switch (spiral cable).
    • Check joint connector-20 (F71). See Figure .
    • Check for open or short between ECM and ASCD steering switch.
    Repair as necessary.
  6. Disconnect ECM harness connector. Check continuity between ASCD switch harness connector terminal No. 1 and ECM harness connector terminal No. 50 (Green/Yellow wire). Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step  8 .
  7. Check the following:
    • Check for poor connection at White, 18-pin connector F53 terminal No. 5 (Green/Yellow wire). See Figure . Connector is located near ECM. See Figure .
    • Check combination switch (spiral cable).
    • Check for open or short between ECM and ASCD steering switch.
    Repair as necessary.
  8. Measure resistance between ASCD steering switch terminals No. 1 and 2. Resistance should be as follows:
    • When every button is released, resistance should be about 4000 ohms.
    • When CRUISE switch is pressed, resistance should be about zero ohms.
    • When COAST/SET switch is pressed, resistance should be about 660 ohms.
    • When ACCEL/RES switch is pressed, resistance should be about 1480 ohms.
    • When CANCEL switch is pressed, resistance should be about 250 ohms.
    If resistance is as specified, go to next step. If resistance is not as specified, replace ASCD steering switch.
  9. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
Fig 1: Identifying ASCD Switch Harness Connector Terminals
G00103824Courtesy of NISSAN MOTOR CO., U.S.A.
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