Service Manual2005 INTELLIGENT SWITCHING UNIT

SECTION 9V

INTELLIGENT SWITCHING UNIT

Caution : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable will help prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.

SCHEMATIC AND ROUTING DIAGRAM

Intelligent Switching Unit Circuit

CONNECTOR CHART

Connector PE3

PIN	Description	Volts
1	Wiper Intermittent Switch Input	-
2	-	-
3	-	-
4	-	-
5	-	-
6	-	-
7	-	-
8	Interior Courtesy Lamp Input	-
9	-	-
10	Battery Saver Input	-
11	Key Halo Lamp Output	-
12	Vehicle Speed Sensor Input	12.5
13	Right Turn Signal Lamp Input	13.2
14	Left Turn Signal Lamp Input	13.2
15	Defogger Switch Signal Input	13.2
16	-	-
17	-	-
18	Hazard Lamp Input	13.2
19	DLC (K Line)	12.6
20	Security Indicator	-
21	-	-
22	-	-
23	Key Reminder Switch Input	-
24	-	-
25	Washer Signal Input	-
26	Ground	-
27	Seat Belt Switch Signal Input	13.3
28	Wiper Return Position Signal Input	-
29	-	-
30	Damper Switch Input	13.2

Connector PE4

PIN	Description	Volts
1	-	-
2	Auto-Up Power Window Signal Input	-
3	Manual-Up Power Window Signal Input	13.3
4	Trunk Open Switch Signal Input	13.2
5	Central Door Locking Switch Signal (Open)	13.2
6	Central Door Locking Switch Signal (Close)	-
7	ECM Communication Input/Output	12.5
8	Door Contact Switch	13.3
9	Door Contact Switch	13.3
10	Auto-Down Power Window Signal Input	-
11	IGN 2 On	13.3
12	Manual-Down Power Window Signal Input	13.1
13	Window Relay Output	13.3
14	-	-
15	Hood Contact Switch Input	13.1

Connector PP1

PIN	Description	Volts
1	Ground	-
2	Door Open Signal Output	-
3	IGN 1 On	13.3
4	Ground	-
5	Central Door Locking Switch Signal (Open)	-
6	Central Door Locking Switch Signal (Close)	-
7	Electric Outside Rearview Mirror Defogger Output	-
8	Rear Window Defogger Output	-

Connector PP2

PIN	Description	Volts
1	Wiper Stop Signal Output	-
2	Interior Courtesy Lamp Output	13.3
3	Wiper Intermittent Switch Output	-
4	Right Turn Signal Lamp Output	-
5	-	-
6	Power Window Up Output	-
7	-	-
8	Left Turn Sinal Lamp Output	-
9	-	-
10	Power Window Down Output	-
11	Trunk Open Switch Signal Output	-
12	Siren Output	-

Connector PP5

PIN	Description	Volts
1	ISU BAT	13.3

FUSE CHART

PIN	Description	Volts
A	Flasher Unit	15A
B	ISU BAT	5A
C	Door Lock	15A
D	Windshield Wiper	25A
E	Power Window	20A
F	Outside Rearview Mirror/Rear Window Defogger Output	30A

DIAGNOSIS

ISU integrates such complex unites and wiring into a micro-controller and also controls itself intelligently.

By doing that, the number of components gets smaller and the wiring simpler, in addition, the diagnostics of electrical easier by using the scan tool.

There is a communication circuit between ISU and the scan-100, following items can be serviced.

- Input condition display.

- Actuating the outputs.

- Key coding the transmitter.

- Output condition display (ON/OFF).

Diagnostic Trouble Codes

DTC	Description	Reference Section
21	Rear Defroster Switch Error	9L GLASS AND MIRRORS (9L-5~9L-8)
22	Front Washer Switch Error	9D WIPERS/WASHER SYSTEM (9D-7)
23	RF Transmitter Battery Error	9T REMOTE KEYLESS ENTRY AND ANTI-THEFT SYSTEM
24	RF Key Resetting Error	9T REMOTE KEYLESS ENTRY AND ANTI-THEFT SYSTEM
25	Power Window Up Switch (Manual)	9P DOORS (9P-9 ~ 9P-10)
26	Power Window Down Switch (Manual)	9P DOORS (9P-9 ~ 9P-10)
27	Power Window Up Switch (Auto)	9P DOORS (9P-9 ~ 9P-10)
28	Power Window Down Switch (Auto)	9P DOORS (9P-9 ~ 9P-10)
29	Driver Side P/Window Current Error	9P DOORS (9P-9 ~ 9P-10)
33	Immo. Antenna Incorrect Value	9T IMMOBILIZER ANTI-THEFT SYSTEM
33	Absence of Immo. Antenna/Link Error	9T IMMOBILIZER ANTI-THEFT SYSTEM
34	Link Immo. Antenna Error	9T IMMOBILIZER ANTI-THEFT SYSTEM
35	Immo. Antenna Short to B+	9T IMMOBILIZER ANTI-THEFT SYSTEM
36	Immo. Antenna Short to GND/Open	9T IMMOBILIZER ANTI-THEFT SYSTEM

Lamp Activation

No	Actuator	Operation
1	Left turn lamp	3 times activated within 5 sec
2	Right turn lamp	3 times activated within 5 sec
3	Room lamp	3 times activated within 5 sec
4	Key halo lamp	3 times activated within 5 sec
5	Anti-theft indicator	3 times activated within 5 sec

Other Activation

No	Aactuator	Operation
1	Door open warning buzzer	1 times activated within 5 sec
2	Power window Relay	3 times activated within 5 sec
3	Power window Down	3 times activated within 5 sec
4	Power window Up	3 times activated within 5 sec
5	Defroster	3 times activated within 5 sec
6	Center Door LOCK	1 times activated within 5 sec
7	Center Door UNLOCK	1 times activated within 5 sec
8	Trunk Open	1 times activated within 5 sec
9	Anti-theft Alarm	3 times activated within 5 sec

Sensor Data

No	Items	Value
1	Rear Defogger Switch	ON / OFF
2	Power Window Switch (Manual)	-
3	Power Window Switch (AUTO)	-
4	-	ON / OFF
5	Wiper Intermittent Switch	ON / OFF
6	-	ON / OFF
7	Driver Door Lock Switch	OPEN / CLOSE
8	Passenger Door Lock Switch	OPEN / CLOSE
9	Trunk Switch	OPEN / CLOSE
10	Hood Switch	OPEN / CLOSE
11	Center Door Lock Switch	LOCK / UNLOCK
12	Door Key Switch	YES / NO
13	-	ON / OFF
14	Hazard Lamp Switch	ON / OFF
15	Turn Signal Lamp Switch	NORMAL / LEFT / RIGHT
16	Seat Belt	OPEN / CLOSE
17	Key Reminder	YES / NO
18	Wiper Intermittent Motor Current	[ mV ]
19	Battery Voltage	[ V ]
20	Power Window Motor Current	[ mA ]
21	-	[ mA ]
22	The Number of Code Keys	1 / 2
23	Door Lock	NORMAL / OPEN / CLOSE
24	-	-
25	-	YES / NO
26	Power Window Main Relay	YES / NO
27	-	YES / NO
28	-	YES / NO
29	-	YES / NO
30	Right Turn Lamp Operation	YES / NO
31	Door Open, Interior Lamp Operation	YES / NO
32	Door Open, Key Halo Lamp Operation	YES / NO
33	Speed Sensitive Door Lock	ON / OFF

MAINTENANCE AND REPAIR

ON-VEHICLE SERVICE

Intelligent Switching Unit(ISU)

Removal Procedure

Disconnect the negative battery connector.
Remove the instrument panel under cover. Refer to Section 9G, Interior Trim.
Remove the knee bolster. Refer to Section 9G, Interior Trim.

Disconnect the electrical connectors.
Remove the nuts securing the Intelligent Switching Unit (ISU).
Remove the Intelligent Switching Unit (ISU).

Installation Procedure

Install the ISU with the nuts.
Connect the electrical connectors.

Install the knee bolster. Refer to Section 9G, Interior Trim.
Install the instrument panel under cover, Refer to Section 9G, Interior Trim.
Connect the negative battery connector.

GENERAL DESCRIPTION AND SYSTEM OPERATION

ISU(Intelligent Switching Unit)

Because the conventional electric systems, in which simple timers, relays and individual control units are used, have separate circuit for each system, they require a lot of components as well as complex wiring.

But ISU does not need such things because it integrates such complex units and wiring into a micro-controller and also controls itself intelligently.

By doing that, the number of components gets smaller and the wiring simpler, in addition, the diagnostics of electrical systems easier by using the scan tool.

Defogger

Power source is IGN2. If you press the defogger switch ON, the rear glass and ORVM defoggers operate for 15 ± 3 min automatically. If you press the switch once again or turn OFF IGN 2 power while the defoggers are operating automatically, then the defoggers are turned OFF.

Central Door Locking (Default Operation)

If you press LOCK / UNLOCK buttons of the door locking switches on the driver or co-driver door, 4 doors are locked / unlocked all together.

If you lock / unlock by the key or knob of the driver door, 4 doors are locked / unlocked all together.

If you press LOCK / UNLOCK buttons of the transmitter while the ignition key is out of the ignition cylinder, 4 doors are locked / unlocked all together. In this case, according to its condition, the anti-theft system goes into armed or disarmed mode.

The door locking actuator operates for about 0.2 sec.

Key Reminder Warning

If the driver door is opened with IGN ON and Key reminder switch ON, Internal buzzer of ISU operates.

If you remove the ignition key from the key cylinder or turn IGN ON while the buzzer is operating, Buzzer goes OFF.

Light Warning

When you open the driver door with light ON (Light switch 1 or 2 step), Buzzer operates.

If the driver door is closed or the light switch is turned OFF while the buzzer is operating, it goes OFF.

Seat Belt Warning

When you turn the ignition ON with the driver seat belt unbuckled, (the seat belt switch ON) Buzzer operates for 6 ± 1 sec.

If you buckle up the driver seat belt (the seat belt switch OFF) or turn the ignition OFF within 6 ± 1 sec since the buzzer operated, the buzzer goes OFF.

Because the seat belt warning lamp is not controlled by ISU but controlled directly by the seat belt switch, the lamp stays ON as long as the seat belt unbuckled.

Turn Lamp & Hazard Lamp

Power source of the turn lamp is IGN 1 and the hazard lamp's B+.

If one of the turn lamps malfunctions, other turn lamps of that side blink two times faster than normal one. (normal : 85 Hz) But the side turn signal lamp is not concerned.

Power Window

The power window relay is grounded by ISU when ISU receives IGN 2 power. When the power window relay is energized, the main switch of the driver power window and the motorized ORVM are supplied operation power to the driver power window switch of the main switch has 2 steps such as 1st step, manual UP/DOWN, and 2nd step, automatic UP/DOWN.

The power window motor halts automatically in case that the motor current reaches 85% of the initial starting current in auto mode UP/DOWN.

The power window motor halts automatically in case that the switch is pressed on again in auto mode UP/DOWN.

Wiper

The wiper can operate when IGN 1 power is supplied.

When the INT signal of the wiper switch is supplied to ISU, the internal relay of ISU is energized for 0.5 sec, and the wiper motor starts to move. After 0.5 sec, the motor operates just one cycle and stops at its parking position by the cam plate switch circuit of the wiper motor.

Intermittent time can be adjusted from 1.5 sec through 12 sec by the intermittent time adjusting switch.

If the washer switch input time is more than 0.3 sec, the internal wiper relay of ISU is energized. The wiper motor continue to work while the washer switch is ON. If the washer switch is turned OFF again, the motor cycles 2 times more.

Interior Lamp

When the interior lamp switch is positioned at the middle or the door position, ISU controls interior lamps.

If one of the 4 doors is opened while IGN 1 power is OFF, interior lamps come ON, But if 15 min passes after interior lamps ON, they go OFF automatically in order to prevent battery discharged.

Interior lamps, turned ON automatically by opened door with IGN 1 OFF, stay ON for 7 ± 0.1 sec even since doors are closed again, and for 2 ± 0.5 sec after that 7 sec slowly dimmed and finally go OFF.

With IGN 1 ON, interior lamps are turned ON only while doors opened. (Dimming function disabled)

Key Halo Lamp

If the driver door is opened while IGN 1 power is OFF, the key halo lamp comes ON. It stays ON for 8 ± 0.1 sec even since the driver door is closed.

Because the key halo lamp is disabled during the IGN 1 ON. If IGN 1 is turned ON within the delay time, 8 ± 1 sec, it goes OFF.

Remote Trunk Release & Anti-Theft

Transmitter can control door lock/unlock, auto trunk open, anti-theft system.

Remote Trunk Release

If you press the trunk button of the transmitter with the key reminder OFF the trunk actuator operates for 0.3 ± 0.03 sec. But in the middle of anti-theft alarm stops.

If the trunk button is pressed with the trunk open, the actuator does not operate.

Anti-Theft System

The transmitter is integrated in the ignition key and its battery is replaceable.

Key code consists of FIX code and ROLLING code.

Anti-theft system operates by only the transmitter. If you open the doors, the hood and the trunk not usaing the transmitter or the ignition key, or if you turn the ignition ON, in armed mode, the siren and the hazard lamps operate for 28 sec.

Remote Central Door Locking

If you press LOCK/UNLOCK button of the transmitter in anti-theft armed condition, the central door locking operates as the following chart.

One of the 4 doors is opened.
The trunk is opened.
The hood is opened.

Even if you press buttons of the transmitter while one of the above 3 conditions is met, anti-theft system does not work, and central door locking operates.

But, if the door locking actuator operates by the transmitter while the driver door is open, the driver door is not LOCKED, because UNLOCK operates mechanically by the driver door knob S/W after LOCK operation.

If you press LOCK/UNLOCK button of the transmitter in the anti-theft armed condition, the central door locking operates.

Battery Saver

The Automatic Lighting Off feature turns off the headlamps, park lamps, taillamps, license plate lamps and instrument panel Illumination within seconds of closing the drive's door.

The feature activates if you leave the headlamps switch in the first or second position, remove the key, and get out of the car.