VX II immobiliser issue?

[illiards]

Team,
Assistance needed.
Have new key fob and battery.
Will not open doors when I select the 'open' button of fob.
Checking the immobiliser light thru the window - it is off and not blinking, even though I managed to lock the car with the fob an hour ago.
I can enter the car via the rear wagon door and using the key in the ignition all the dashboard lights come on etc (battery not flat) but the engine does not turn over and the immobiliser light remains off.
The odometer displays the message 'Serv error'.
Any thoughts?

 

[lout]

check the bcm fuse
fuse 31 or 34 cant remember
and too lazy to look it up

 

[illiards]

Thx lout. Will do.

 

[BlackVXGTS]

Why did you need a new key fob, where did you get it from, and what process was used to match it to your car?

Some previous posts have mentioned that this message is caused by a serial bus data fault, but you would need to get the car scanned with a Tech2 or equivalent scan tool to check if any specific error codes have been set. Have you checked the VX owners manual to see what is says about this message? Should be in the section entitled "Vehicle Messages".

Serial Data Bus Fault - sets if the BCM cannot detect six consecutive messages on the serial data bus. This trouble code indicates either a short circuit on the bus or if two or more modules send a message at the same time.

 

[lout]

so far common causes have been
blown fuse to BCM
faulty ABS module
wiring to ecu battery positive
all cases scan tools have not been able to connect

using engineering mode helps narrow it down

Hold mode and up arrow then turn key to on or start

Release buttons

then

Press Mode = Dash Part Number - e.g. 1731
Press Mode = Mode Switch Voltage - e.g. BV - - - 5.0
Press Mode = Battery Voltage - e.g. V 11.8
Press Mode = Petrol Sender Voltage - e.g. FUEL 02.6
Press Mode = LPG Sender Voltage - e.g. VL 5.0
Press Mode = Remaining Fuel - e.g. 38L
Press Mode = Instantaneous Fuel (Liters per Hour) - e.g. 12.8 L/H
Press Mode = Engine Coolant Temp - e.g. 63 C
Press Mode = Vehicle Speed - e.g. 45 KM/H
Press Mode = Tachometer - e.g. 2380
Press Mode = Park Lamps Switch - e.g. P OFF
Press Mode = Dash Trouble Codes - e.g. t 00 (Press up/down to scroll through any codes, these are not PCM, ABS, etc codes)
Press Mode = Dash Test - All gauges will move, lights will come on and buzzer will sound.

Turn key off will revert to normal dash



Dash trouble codes

Format is t then code number then history then current some have nu which I cant remember but believe was not used

Eg

t00-- is fuel gauge sender open circuit no history and no current faults

t16h- is abs history codes but no current fault

00 Fuel gauge sender unit — open circuit

01 Fuel gauge sender unit — short circuit
02 Fuel gauge sender unit — intermittent
03 Fuel gauge sender unit — open circuit

04 LPG gauge sender unit — open circuit
05 LPG gauge sender unit — short circuit
06 LPG gauge sender unit — intermittent
08 No serial data from ABS
09 No serial data from BCM
10 No serial data from ECC
11 No serial data from PCM
12 No serial data from SDM
13 No instrument poll from BCM
14 No serial communication
15 No Sub-clock
16 ABS or ABS/ETC fault logged
17 BCM fault logged
18 ECC fault logged
19 PCM fault logged
20 SDM fault logged
21 Trip switch short circuit
22 Trip switch button stuck
24 EE checksum error
25 ROM checksum error
26 Internal fault

 

[illiards]

Why did you need a new key fob, where did you get it from, and what process was used to match it to your car?

Some previous posts have mentioned that this message is caused by a serial bus data fault, but you would need to get the car scanned with a Tech2 or equivalent scan tool to check if any specific error codes have been set. Have you checked the VX owners manual to see what is says about this message? Should be in the section entitled "Vehicle Messages".

Serial Data Bus Fault - sets if the BCM cannot detect six consecutive messages on the serial data bus. This trouble code indicates either a short circuit on the bus or if two or more modules send a message at the same time.

Old fob have worn seal so water got into circuits. Got the new one at an accredited car locksmith that had produced the past 3 or 4 new fobs I have needed - that all worked fine. I supplied the key security details.
The message 'Serv error' apparently means 'a fault in the trip computer'

 

[illiards]

so far common causes have been
blown fuse to BCM
faulty ABS module
wiring to ecu battery positive
all cases scan tools have not been able to connect

using engineering mode helps narrow it down

Hold mode and up arrow then turn key to on or start

Release buttons

then

Press Mode = Dash Part Number - e.g. 1731
Press Mode = Mode Switch Voltage - e.g. BV - - - 5.0
Press Mode = Battery Voltage - e.g. V 11.8
Press Mode = Petrol Sender Voltage - e.g. FUEL 02.6
Press Mode = LPG Sender Voltage - e.g. VL 5.0
Press Mode = Remaining Fuel - e.g. 38L
Press Mode = Instantaneous Fuel (Liters per Hour) - e.g. 12.8 L/H
Press Mode = Engine Coolant Temp - e.g. 63 C
Press Mode = Vehicle Speed - e.g. 45 KM/H
Press Mode = Tachometer - e.g. 2380
Press Mode = Park Lamps Switch - e.g. P OFF
Press Mode = Dash Trouble Codes - e.g. t 00 (Press up/down to scroll through any codes, these are not PCM, ABS, etc codes)
Press Mode = Dash Test - All gauges will move, lights will come on and buzzer will sound.

Turn key off will revert to normal dash



Dash trouble codes

Format is t then code number then history then current some have nu which I cant remember but believe was not used

Eg

t00-- is fuel gauge sender open circuit no history and no current faults

t16h- is abs history codes but no current fault

00 Fuel gauge sender unit — open circuit

01 Fuel gauge sender unit — short circuit
02 Fuel gauge sender unit — intermittent
03 Fuel gauge sender unit — open circuit

04 LPG gauge sender unit — open circuit
05 LPG gauge sender unit — short circuit
06 LPG gauge sender unit — intermittent
08 No serial data from ABS
09 No serial data from BCM
10 No serial data from ECC
11 No serial data from PCM
12 No serial data from SDM
13 No instrument poll from BCM
14 No serial communication
15 No Sub-clock
16 ABS or ABS/ETC fault logged
17 BCM fault logged
18 ECC fault logged
19 PCM fault logged
20 SDM fault logged
21 Trip switch short circuit
22 Trip switch button stuck
24 EE checksum error
25 ROM checksum error
26 Internal fault

Thx lout
Ran thru your instructions.
Got the following;

t08 HC
t09 HC
t11 HC
t12 HC
t13 HC
t14 HC
t16 HC

 

[illiards]

check the bcm fuse
fuse 31 or 34 cant remember
and too lazy to look it up

Thx lout
It was actually 29 (ENG CONT BCM)
Fuse was all good.

 

[lout]

Fuse was all good.

as in replacing fuse fixed it
or fuse was not faulty and car is still faulting

 

[illiards]

Apologies
fuse was not faulty and car is still faulting