Ford 2003 Mustang Workshop Manual page 3861

Is the resistance less than 5 ohms?
E9 CHECK THE HORN FOR NORMAL OPERATION
Depress the steering wheel horn switch.
Did the horn sound?
E10 CHECK CIRCUIT 1032 (WH/BK) FOR SHORT TO POWER
Disconnect: Parking Lamp Relay.
Disconnect: GEM C201e.
Measure the voltage between GEM C201e Pin 11, Circuit
1032 (WH/BK), harness side and ground.
Is the voltage greater than 10 volts?
E11 CHECK CIRCUIT 1032 (WH/BK) FOR SHORT TO GROUND
Measure the resistance between GEM C201e Pin 11, Circuit
1032 (WH/BK), harness side and ground.
Is the resistance greater than 10,000 ohms?
E12 CHECK CIRCUIT 1032 (WH/BK) FOR OPEN
Measure the resistance between GEM C201e Pin 11, Circuit
Yes
INSTALL a new GEM. For
additional information,
REFER to Section 419-
10 . REPEAT the self-test.
CLEAR the DTCs.
No
REFER to Section 413-
06 .
Yes
GO to E11 .
No
REPAIR Circuit 1032
(WH/BK). REPEAT the
self-test. CLEAR the
DTCs.
Yes
GO to E12 .
No
REPAIR Circuit 1032
(WH/BK). REPEAT the
self-test. CLEAR the
DTCs.
Yes