TROUBLESHOOTING AND ELECTRICAL SYSTEM
Test Procedures
11
TEST PROCEDURE 35 – Brake Light Relay
See General Warning on page 10-1.
1.
Inspect the brake light relay for proper operation.
NOTE:
The aid of an assistant will be required to inspect the brake light relay for proper operation.
1.1. With the key switch in the OFF position and the key removed, press the brake pedal while an assistant
observes the brake lights. The brake lights should not function when the key switch is in the OFF position.
1.2. Insert the key and turn it to the ON position. With the key switch in the ON position, the brake lights
should illuminate when the brake pedal is pressed.
1.3. Set the park brake by pressing the brake pedal firmly and tilting the park brake portion of the pedal forward
with your foot. The brake lights should not illuminate with the park brake engaged.
2.
If the brake lights operate exactly as described in step 1, the brake light relay is operating correctly.
3.
If the brake lights do not illuminate when the key switch is ON and the brake pedal is pressed, proceed to step 7.
4.
If the brake lights illuminate when the brake pedal is pressed and the key switch is in the OFF position, the
brake light relay has failed closed.
5.
Disconnect battery and spark plug wire(s).
See Disconnecting the Battery – Gasoline Vehicles, Section 10,
6.
Remove the center dash assembly.
See Key Switch Removal, Section 12, Page 12-14.
7.
Test the relay for the failed closed condition.
7.1. Remove the voltage suppressor wires (17) from the relay coil terminals
7.2. Remove the two wires (15 and 16) from the relay contact terminals.
7.3. Using a multimeter set to 200 ohms, place the black (–) probe of the multimeter on the relay terminal
marked COM (common). Place the red (+) probe on the relay terminal marked NO (normally open). The
multimeter should indicate no continuity. If the multimeter indicates continuity, the relay has failed closed.
7.4. If the relay has failed closed, replace the relay.
See Relay Removal, Section 12, Page 12-31.
18
15
12
16
13
10
17
1411
Figure 11-52
Brake Light Relay Test
8.
Bypass the brake light relay.
8.1. Disconnect battery and spark plug wire(s).
See Disconnecting the Battery – Gasoline Vehicles, Section
2009 FE 350 Maintenance and Service Supplement
Page 11-51
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