RE: Ok, this is a little goofy.....
Short of tearing my car apart and taking digital pics, the next best
thing is to post diagrams from my EVTM. I looked for better pics in
the service manual to no avail.
OK, that being said, first the ground(G301):
http://home.earthlink.net/~japeters01/_uimages/G301.jpg
This looks to be low on the passenger side door pillar or perhaps the
door sill. If on the door pillar, ir would be behind the kick panel
(or carpet) or if on the door sill it would be behing the sill plate.
It will be a black wire(s) with a ring terminal secured to the body
by a hexhead bolt/screw. Usually these ground bolts have a greenish
coating to negate corrosion. Obviously you would be looking for an
open circuit preventing a good ground.
This ground is from circuit 57(BK)(pin 6) on the DRL connector(C229):
http://home.earthlink.net/~japeters01/_uimages/C229.jpg
The DRL resistor is on circuit 932(GY/W)(pin 4) on the DRL connector.
This feeds a reduced voltage to the DRL module from the DRL resistor
which BTW is located way up front behind the grill I believe. Check
this circuit for opens.
Then finally the Park Brake Switch and circuit 512(T/LG)(pin 1) on
the DRL connector. Connector 252 connects to the switch on the park
brake lever assembly:
http://home.earthlink.net/~japeters01/_uimages/C252.jpg
You can disconnect this connector(C252) and isolate the switch for
testing. The switch is closed to ground with the park brake lever
depressed and open(no connection to ground) with the park brake fully
released. Check the operation of the switch and look for a short to
ground on this circuit.
The block diagram for the DRL circuits
http://home.earthlink.net/~japeters01/_uimages/DRLcircuit.jpg
shows the relationship of all the components to the DRL module.
From the manual:
How The Circuit Works
With the Ignition Switch in RUN, the Main Light Switch in OFF or PARK
and the Park Brake released, the Daytime Running Lamps (DRL) Module
illuminates the Lo Beam Headlamps at reduced power.
Power for the Lo Beam Headlamps is provided by the Horn/DRL Fuse.
Current flows through the Horn/DRL Fuse, the DRL Resistor and the DRL
Module to the Headlamps. The DRL Resistor reduces power to the Lo
Beams.
When the Main Light Switch is switched to HEAD, the DRL Module
switches full power to the Lo Beam Headlamps through the Headlamps
Fuse, the Main Light Switch, the Multi-function Switch and the 188
(W/BK) wire.
The DRL Module also controls the Brake Indicator. If the Park Brake
Switch is closed, the DRL Module will turn off the Lo Beam Headlamps
and ground the Brake Indicator.
--------------------------------
Note the last paragraph. Does the Brake Indicator work? If it does, I
would lean towards the DRL resistor circuit. The brake indicator lamp
should be lit whenever the park brake is applied or the ignition
switch is in start position. Be wary however that the switch
could 'bleed' enough to ground to disable the DRL but NOT illuminate
the Brake Indicator lamp.
And finally:
----------------------------
Daytime Running Lamps
Canadian Vehicles Only
The Daytime Running Lamp (DRL) system is designed to turn the low-
beam headlamps of the vehicle ON, when the following conditions are
met:
*The ignition switch is in the RUN position.
*The parking brake is fully released.
*The headlamp system is in the OFF position.
The DRL system incorporates a fuse in the power distribution box, a
relay located on the RH side of the instrument panel behind the glove
compartment and a resistor mounted to the right end of the front
bumper bar. The wiring is connected to the 14401 wiring assembly. The
DRL output cannot be measured using most multi-meters nor can the DRL
be adjusted.
---------------------------
I hope this is of some help.