Nissan Maxima Service and Repair Manual: P1564 ASCD steering switch
Description
ASCD steering switch has variant values of electrical resistance for each
button. ECM reads voltage variation
of switch, and determines which button is operated.
Refer to EC-68, "System Diagram" for the ASCD function.
DTC Logic
DTC DETECTION LOGIC
NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis
for DTC P0605. Refer to
EC-391, "DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform
the following before conducting
the next test.
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
2.PERFORM DTC CONFIRMATION PROCEDURE
- Turn ignition switch ON and wait at least 10 seconds.
- Press MAIN switch for at least 10 seconds, then release it and
wait at least 10 seconds.
- Press CANCEL switch for at least 10 seconds, then release it and
wait at least 10 seconds.
- Press RESUME/ACCELERATE switch for at least 10 seconds, then
release it and wait at least 10 seconds.
- Press SET/COAST switch for at least 10 seconds, then release it
and wait at least 10 seconds.
- Check DTC.
Diagnosis Procedure
1.CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E9.
2.CHECK ASCD STEERING SWITCH CIRCUIT
With CONSULT
- Turn ignition switch ON.
- Select "MAIN SW", "CANCEL SW", "RESUME/ACC SW" and "SET SW" in
"DATA MONITOR" mode with
CONSULT.
- Check each item indication under the following conditions

Without CONSULT

- Turn ignition switch ON.
- Check the voltage between ECM harness connector terminals
under the following conditions.

3.CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Disconnect combination switch harness connector.
- Check the continuity between combination switch and ECM harness
connector.
- Also check harness for short to ground and short to power.

4.DETECT MALFUNCTIONING PART
- Check the following. Harness connectors E30, M11
- Combination switch (spiral cable)
- Harness for open and short between ECM and combination switch
5.CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Check the continuity between combination switch and ECM harness
connector.
- Also check harness for short to ground and short to power
6.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E30, M1
- Combination switch (spiral cable)
- Harness for open and short between ECM and combination switch
7.CHECK ASCD STEERING SWITCH
8.CHECK INTERMITTENT INCIDENT
Component Inspection
1.CHECK ASCD STEERING SWITCH

- Turn ignition switch OFF.
- Disconnect combination switch (spiral cable) harness connector.
- Check resistance between combination switch harness connector
terminals as per the following.

Description
The power generation voltage variable control enables fuel consumption to be
decreased by reducing the
engine load which is caused by the power generation of the generator. The
batt ...
Description
When the brake pedal is depressed, ASCD brake switch is turned OFF and stop
lamp switch is turned ON.
ECM detects the state of the brake pedal by those two types of input (ON/OFF
s ...
Other materials:
Horn
Description
Horn (high/low) is located inside of front bumper and
operates when theft warning system is in alarm phase.
Component Function Check
1.CHECK FUNCTION
Select HORN in "ACTIVE TEST" mode with CONSULT.
Check the horn (high/low) operation.
Diagnosis Pro ...
Both side headlamps (LO) are not turned on
Description
The headlamps (both sides) do not turn ON in any lighting switch setting.
Diagnosis Procedure
1.CHECK COMBINATION SWITCH (LIGHTING AND TURN SIGNAL SWITCH)
Check the combination switch (lighting and turn signal switch).
2.CHECK HEADLAMP (LO) REQUEST SIGNAL INPUT
CONSULT DATA MONITOR ...
Power supply and ground circuit
AV CONTROL UNIT
AV CONTROL UNIT : Diagnosis Procedure
1.CHECK FUSES
Check that the following fuses of the AV control unit are not blown.
2.POWER SUPPLY CIRCUIT CHECK
Disconnect AV control unit connectors M115 and M119.
Check voltage between the AV control unit connectors M115 and
...