[zeb crusaders]

I need help for Immo Off on NNN ECU for TD5. The eeprom is 93C66.
I have for older MSB ECU with 93c46.
I have written an AVR emulator that emulates AS10 alarm, but I sometimes have trouble with it.

rgds,
Haavard
Norway

[satmanek]

I used to have exactly the same problem. From what I know there is no way to immo off in this driver but can be disabled in the driver
lucas 10AS is not only stable solution, do not use the remote control and can be disabled by disconnecting the battery. This can be done Autologic diagnostic tool. My car runs from the so off.


SlaweK

[zeb crusaders]

I have the TD5 engine in a Range Rover classic and do not have the AS10 installed.
I know it is possible to do immo off with just some eeprom changes. I have done it several times on the MSB series and I have seen the solution for NNN series ECu too.

This is the stuff I use now. It works 99% of the time. If it starts and works for a second there is a time litmit to start again on about 15 seconds. You can hear the main relay drop and then You are ready to start again.

Build this circuit around an AVR, almost any will work and do a sequrity code learn with any diagnostic tool and You are good to go.
This code snippet on an AVR does the immo emulation.
Just need a transistor output with a pullup to + 12volt to generate the "bus" signal.

// #include <avr/interrupt.h>
#define F_CPU 1000000UL

#include <avr/io.h>
#include <util/delay.h>
#include <stdlib.h>



static void sec_send_byte(char b) {
PORTA = (b & 0x01) ? 0xFF : 0x00; _delay_ms(4);
PORTA = (b & 0x02) ? 0xFF : 0x00; _delay_ms(4);
PORTA = (b & 0x04) ? 0xFF : 0x00; _delay_ms(4);
PORTA = (b & 0x08) ? 0xFF : 0x00; _delay_ms(4);
PORTA = (b & 0x10) ? 0xFF : 0x00; _delay_ms(4);
PORTA = (b & 0x20) ? 0xFF : 0x00; _delay_ms(4);
PORTA = (b & 0x40) ? 0xFF : 0x00; _delay_ms(4);
PORTA = (b & 0x80) ? 0xFF : 0x00; _delay_ms(4);
}

static void sec_send_half_byte(char b) {
PORTA = (b & 0x01) ? 0xFF : 0x00; _delay_ms(4);
PORTA = (b & 0x02) ? 0xFF : 0x00; _delay_ms(4);
PORTA = (b & 0x04) ? 0xFF : 0x00; _delay_ms(4);
PORTA = (b & 0x08) ? 0xFF : 0x00; _delay_ms(4);
}

void alarm_heartbeat() {
char code[5] = {0b11001110, 0b10110010, 0b01010100, 0b01010101, 0b00001101};
while(1) {
sec_send_byte(code[0]);
sec_send_byte(code[1]);
sec_send_byte(code[2]);
sec_send_byte(code[3]);
sec_send_half_byte(code[4]);

_delay_us(100);
}
}

int main(void) {
DDRA = 0xff;
PORTA = 0xff;

alarm_heartbeat();
}

[gezame]

Hi
Yes, i can do in 93C66.
Br.

[zeb crusaders]

That sounds good Gezame !

[chiper1]

I really want to program this to an avr chip but it says there's an error in line 13, I've selected atiny2313 in avr studio. I have a defender and want to make my own security system as a lot of them go missing in my neck of the woods

[obdsystems]

I really want to program this to an avr chip but it says there's an error in line 13, I've selected atiny2313 in avr studio. I have a defender and want to make my own security system as a lot of them go missing in my neck of the woods

this is related with  5-as