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The switch is under the center console, screws are on the sides, at the base of the shifter handle. Try using CNC Contact cleaner and adjusting the switch position before replacing.
broken wire, bad ground, etc?
The backup light switch on a 240 with an automatic transmission is mounted to the shifter. To access the switch you need to remove the plastic cover with the PRND21 indicator. You will have to move the shifter to do all this, so make sure the car is off and the parking brake is set. 1. Remove the two screws at the front of the shifter housing cover. 2. Pull shifter back to any gear position 3. Carefully lift up the end of the cover where the screws were and slide it towards the rear. It should come off the metal clip that pokes through the rear of it. Look to the right of the shifter stick - the plastic wedge is the switch. It is attached with two screws from the right side. After you remove them you should be able to pull it out after some wiggling and playing with the shifter. Installation is the reverse.
your headlamp switch on the dashboard has a small screw on it. its a 3 position switch. turn it to switch daytime running lights off.
its located at the bottom of the shifter assembly under the consol.
there is a little lever you have to switch to the left. It is inside the compartment where the on the bottom where the gear shifter knob comes out.
you do not adjust the brake lights check the bulbs or check switch top of brake pedal.
the ignition switch is bad
u need to replace light switch
I had a similar problem with my S70 and discovered the headlight switch was defective. The switch had actually begun to separate causing the contacts for the tail lights not to make contact. Try having someone observe the tail lights while you push on the headlight switch. If the tail lights begin to work, replace the headlight switch.
check the wiring to the sensor switch on top of the gear box one is for the overdrive and one is reverse but check all fuses first.
I removed the Relay.......Cut wire From Trans Connector/Heat shrink...... Ran wire to connect shifter wire (one side)...Replaced switch with off/on switch/led ....Super glued on shifter...4th Gear switch (forward position)...3rd Gear back position...Other side of wire connected to accessory power.... Problem solved...Switch $ 8.00 at Radio Shack... Dedicated Shifter...No Relay....