Sentra Sedan L4-1597cc 1.6L SOHC (E16S) (1986)
Diagnostic Procedure # 9 Zone continuity
Diagnostic Procedure # 10 Alarm will not silence with key
Diagnostic Procedure # 11 No alarm with impact
Diagnostic Procedure # 12 Engine will not crank
Diagnostic Procedure # 13 Main Power Supply and Ground Circuit Checks
Impact Sensor Inspection
Siren Check
Console Switch Inspection
System Pin Test
Circuit Diagram
Preparation For System Checks
Service Parts Listing
Control Unit
The control unit is located under the instrument panel. The unit consists of a radio receiver which receives signals from the remote control transmitters
and a micro processor which receives various input signals and controls the system output. Power is supplied at all times through a 10 amp in-line fuse to
terminals # 2 and # 5. System ground is supplied through terminal # 1.
Inputs
a)
The console switch (located on the center console) inputs selected operating modes. When the switch is in the AUTO mode no signal is supplied
to the control unit. When in the IMPACT OFF mode a 12 volt signal is supplied through terminal # 18 and when in the ALARM OFF mode a 12
volt signal is supplied through terminal # 17.
b)
The impact sensor supplies a pulse to the control unit through terminals # 14 (light impact) and # 11 (heavy impact).
c)
The trunk room lamp switch supplies input through terminal # 9 indicating that the trunk has been opened. This will trigger an alarm when the
system is armed or an error code when attempting to arm the system with the trunk open.
d)
The hood switch supplies input through terminal # 8 indicating that the hood is open. This will trigger an alarm if opened with the system armed or
an error tone when attempting to arm the system with the hood open.
e)
The door switch supplies input through terminal # 10 indicating that a vehicle door has been opened. This will trigger an alarm if opened when the
system is armed or an error tone when attempting to arm the system with a door open.
f)
The ignition switch supplies input through terminal # 19 indicating that the switch is in the ACC position. This signal will disarm the system when
passively armed, silence the alarm or disallow the system to be armed.
g)
The door lock timer supplies input through terminal # 16 indicating that the doors have been locked with the power door lock switch (passive
arming).
Outputs
a)
Terminal # 20 supplies a pulse to the door lock timer to lock the doors when locked or armed with the remote control.
b)
Terminal # 12 supplies a pulse to the door lock timer to unlock the doors when unlocked or disarmed with the remote control.
c)
Terminal # 6 supplies a ground output to sound the siren.
d)
Terminal # 13 supplies a ground output to illuminate the LED on the console switch.
e)
Terminal # 21 supplies a ground output to turn on the interior light when the system is disarmed and flashes the light when an alarm is sounding.
Start Cut
The ignition switch start signal is routed to the control unit through terminal # 7 and relayed out through terminal # 4. In the event that an alarm is
sounded the control unit will not relay the start signal out until the system has been disarmed.
Service Procedure