Fig. 19.22. Checking the light switch, low beam switch and turn signal switch: 1 – closed terminals when low beam is on ("Lower"); 2 – closed terminals when high beam is on ("Upper")
1. Disconnect the electrical connectors from the switch and check the condition (closed or open) of the electrical circuits between the contacts, which should correspond to those shown in Fig. 19.22. Take measurements in all switch positions.
Fig. 19.23. Location and testing of headlight and taillight relays: 1 – Rear light relay (cars with daytime running lights); 2 – headlight relay
2. Remove the headlight and taillight relays from the relay box and check the condition (closed or open) of the electrical circuits between the contacts, which should correspond to those shown in Fig. 19.23.
3. Check the condition of the contacts of switches and relays. If the contacts are oxidized, clean them.
4. If the electrical circuit condition is not as required, replace the switch.
Fig. 19.24. Checking the headlight range control switch
5. Check the resistance of the headlight range control switch between the switch contacts (Fig. 19.24).