Trying to repair airbag warning light code 42, front crash sensor. I tried to remove the central latch plate to access the crash sensor but the 2 bolts that go inside the air intake snorkel just spin and spin. Assuming I am just spinning a nut on the inside when I turn the bolt head but I can see no way to get a wrench in there even with the air filter housing removed. No matter, I can pull the latch plate forward and get the crash sensor off. At step 6 in the procedure (attached picture) the voltage at the sensor pin should be greater than 4V. It is only a few millivolts. Next step is to measure resistance to RCM connector CA450 pin 19. Which one is that??

Electrical manuals I found here: JagRepair.com - Jaguar Repair Information Resource show pin numbers for ECUs, climate control modules, transmission control modules, etc. They do no show pin numbering for the Restraint Control module. Anyone have another source so I can find the right wire to ring out?

 

Doesn't the stated color code work?

 

I am looking for a white wire in a 40 pin connector. 15% of the wires in this 40 pin connector (CA450) are white. The white wire is next to a brown wire. 10% of the wires are brown. At least 4 of the white wires are adjacent to a brown wire in this connector I think, but I can't be sure because I don't know what the pin numbers are. Is pin 19 physically adjacent to 20? Or are they on different rows? Normally I would just ring out all 6 of the white wires and all 4 of the brown wires, but being that this system deploys the airbags I was hoping for more precision.

And I'm lazy Dell, I don't want to measure all those wires. Or hand map out the wire color codes to be certain I have the right pins in the right orientation. I want the Cliffs Notes.

 

 

Thanks. I got it that way from the diagram for the CA450 connector. I was hoping somebody had something like below, I diagram of which connector, what color is the connector, what is the pattern of pin numbering, and what color is the wire. I can find this diagram for the ECM, Trans CM, ABS CM, Traction/Stability CM, Climate CM, Navigation CM, Dashboard CM,... but I can't find the diagram for the Restraint Control Module. It would have saved me some time.

 

Without the pin out diagram you need to pry off the back cover of the connector to see the wire colors, just use a very small flat head screwdriver and gently pry off the 4 clips. If anyone has a similar problem and finds this thread, here is where you can find pins 19 and 20 that connect to the front crash sensor.

In this picture I have my test lead connected to pin 20.