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.

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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 ...
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and viscosity engine oil to ensure satisfactory
engine life and performance. For additional information,
refer to "Recommended fluids/lubricants
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Front door speaker
Removal and Installation
REMOVAL
Remove the front door finisher. Refer to INT-18, "Removal and
Installation".
Remove the front door speaker screws (A).
Disconnect the harness connector from the front door speaker
(1) and remove.
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Power supply and ground circuit
BCM
BCM : Diagnosis Procedure
1. CHECK FUSE AND FUSIBLE LINK
Check if the following BCM fuses or fusible link are blown.
2. CHECK POWER SUPPLY CIRCUIT
Turn ignition switch OFF.
Disconnect BCM.
Check voltage between BCM harness connector and ground.
3. CHECK GROUND CIRCUIT
Che ...