07 rx350 is there a tach wire in cabin?

Hi guys, I started R/S install on my 2007 RX350 today, everything is going good except the tach wire which needs to go to an injector under the hood. Running wires through the firewall has proven to be a total pain in the butt. There's no access at all from under the hood and very poor access from within the cabin. I've spent about two hours trying to do it but have failed so far. The two times I managed to run a cloths hanger through, the pulling back of a taped wire failed. Might try soldering the wire to the hood hanger tomorrow. Is there a tach wire somewhere in the cabin that I can tap? It seems Highlanders have a ODB2 one on pin 9 but my RX does not have that pin connected. Thanks :)

Alternative might be instrument panel or engine management, you'd need to either test every wire or obtain circuit diagram/pin outs. PS wrap the wire round the coat hanger then spray WD 40, that's an alternative.

Alternative might be instrument panel or engine management, you'd need to either test every wire or obtain circuit diagram/pin outs. PS wrap the wire round the coat hanger then spray WD 40, that's an alternative.

3 places for tach wire: WHITE (AC) behind gauge cluster WHITE (AC) ECM behind glovebox Second connector pin 1. WHITE (AC) Steering column Junction Connector towards bottom pin 2 of 12pin plugTed

2nd Year Tier 1 Medical School

Still installing as a hobby...pays for groceries

Compustar Expert

Thanks How would you test AC write?

Sorry, meant how would you test a AC wire when all constants are DC.

DMM, set to 20VAC, black probe to ground, red to suspect wire 1.5 -5 VAC on engine run only. Technically it isn't AC it's a DC pulse but it tests on a meter as AC.

I agree with Howie, and also as a general rule, an installer (especially a novice) should NEVER connect to wires in the car without testing them first. On the other hand, the tachometer wire on the remote starter is only an input, not an output. So, I think if all else fails, it's OK to connect the tachometer wire to the suspected wire in the car, and try to program tach to the remote starter. If it programs, try the remote starter and make sure it works. If it doesn't program, it's the wrong wire.

X 2 with Chris and sometimes I attach without soldering, the tach wire to suspect wire then program tach. In theory at least on older Cliffords there was a megohm resistance so you are unlikely to do any damage. But then it's moot, test the wire(s) Ted gave you.

In case you have an auto ranging meter, don't use the auto feature, set it to manual. Like Howie mentioned, it should range between 1.5-5V (should fluctuate if you rev the engine a little).