Power key switch question

[Ozruss90]

Just got home from a work trip last night. Had visitors for dinner, so no work on the Z. When l get home from work tonight, I’ll be heading for the shed, armed with new info that was forwarded on to me. Many thanks WVZR-1 for your help.
Hopefully can work it out. Stay tuned for an update .

Cheers from down under 🇦🇺

Russell

[Ozruss90]

Ok, so latest update.
.. Valet switch tested and works fine.
.. Power at main fuse panel as per normal and 5 amp fuse ok
.. Still no Full Engine Power light on in the DIC
I’m assuming that if the globe in the DIC is out, it would cut the circuit and prevent the operation of the secondaries ( looking at the diagram at 8a-82-4)

Went take off the DIC front panel, 3 torx screws accessible but the top RH screw is behind a section of dash padding and not accessible.
Can someone please help with the removal of the DIC to check globe.
Hope I’m the right path here.

Cheers
Russell

[lfalzarano]

Before tearing up the DIC display, I would take the car out, warm it up, then redline it. If you notice extreme acceleration, then the bulb is out. [emoji23]


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[lfalzarano]

Use this to Chart #29 page 8A-82-21 to diagnose the DIC "Full Power" light. Good Luck


BTW: with the engine off, turn the key just before the Start detent. That is the "Bulb Test" for the DIC. All indicators should light up, including the "Full Power" bulb.

"Full Engine Power" Indicator
(VIN J Only)
When the Valet Mode Switch is moved to "ENGINE POWER," the switch will apply ground to one side of the "Full Engine Power" Indicator bulb, illuminating it.

[Ozruss90]

Originally Posted by lfalzarano

Use this to Chart #29 page 8A-82-21 to diagnose the DIC "Full Power" light. Good Luck


BTW: with the engine off, turn the key just before the Start detent. That is the "Bulb Test" for the DIC. All indicators should light up, including the "Full Power" bulb.

"Full Engine Power" Indicator
(VIN J Only)
When the Valet Mode Switch is moved to "ENGINE POWER," the switch will apply ground to one side of the "Full Engine Power" Indicator bulb, illuminating it.

Thanks Lou,
When the ignition key turned to ON, prior to start “bulb test” the FULL POWER does NOT come on in the DIC and never has.
There IS power at the appropriate fuse within the main fuse block.
The ground side of the valet switch DOES in fact go earth. Tested.
So.......Power at the fuse✔️ No power at the Valet switch ✖️
Globe that lights the Full Power lamp in the DIC that does NOT work is between the fuse and the valet switch
It appears it needs the globe to be working correctly, to complete the whole circuit.
I’m still leaning towards the globe being out .
Have l miss diagnosed this.?????

Cheers
Russell

[lfalzarano]

According to the chart I sent last, it can be a broken wire in the circuit, bulb or the flexible circuit board. The last would be tough to source and replace. [emoji1317] Hoping it is one of the 1st two. Good Luck.


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[Ozruss90]

LATEST UPDATE.
Pulled the DIC out of the car . As suspected a blown globe for the Full Engine Power circuit. Special type of twist in globe and globe holder that l couldn’t get, so l robbed a globe/globe holder unit from the service engine soon circuit and put it in place of Full Engine Power.
Replaced DIC back into dash, re-connected battery, connected valet switch (temporarily), turned key to on and now had Full Engine Power light up in the DIC.
Put everything back together and took the the car for a test run.
Well We’ll Well. I now have a ZR-1 that goes like a ZR-1 should.
Spins up to 7k rpm easily and pulls hard.
Certainly put a smile on my face.😀😀

Just need to track down where to get these little globe/globe holder units from so l can replace the one l robbed .

Cheers from down under 🇦🇺
Russell

[lfalzarano]

I would assume you might get a globe/globe holder from a Service Soon part from a wreaked regular C4 of that vintage at a junk yard. Not sure that electrical part is available online. Someone on the forum might assist with a source.


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[WVZR-1]

That's good to hear. I'd think a PC74 bulb/socket wouldn't be a difficult find even in AU. PC74 I believe should have a grey socket. Any year '90+ C4 in the DIC would use PC74 same bulbs

[aafc]

For the globe/ lamp check out this web site batee.com. He has a good line of parts and repair information for ZR-1's and reg C4's instruments.
John
1990 white/black #2546
one of a few auto Eq 4l8OE's ZR-1's