Pinpoint Test J: The Turn Signal Lamps Are Inoperative

J1 CHECK THE STOPLAMPS
- Key in ON position.
- Apply and release the brake pedal while observing the rear lamps.
- Do the stoplamps operate correctly?
- Yes : GO to J2.
- No : REFER to STOPLAMPS to continue diagnosis of the stoplamps.
J2 CHECK CIRCUIT 91-LG27 (BK/GN) FOR AN OPEN
- Key in OFF position.
- Disconnect: Multifunction Switch C202.
- Measure the resistance between the multifunction switch C202-2, circuit 91-LG27 (BK/GN), harness side and ground.
  
  Fig 1: Measuring Resistance Between Multifunction Switch C202-2, Circuit 91-LG27 (BK/GN), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to J3.
- No : REPAIR the circuit. TEST the system for normal operation.
J3 CHECK CIRCUIT 91S-LG1 (BK/YE) (LH TURN) AND 91S-LG2 (BK/BU) (RH TURN) FOR AN OPEN
- Disconnect: GEM C201d.
- Measure the resistance between the multifunction switch C202-1, circuit 91S-LG1 (BK/YE), harness side and the GEM C201d pin 17, circuit 91S-LG1 (BK/YE), harness side; and between the multifunction switch C202-3, circuit 91S-LG2 (BK/BU), harness side and the GEM C201d pin 19, circuit 91S-LG2 (BK/BU), harness side.
  
  Fig 2: Checking Circuit 91S-LG1 (BK/YE) (LH Turn) And 91S-LG2 (BK/BU) (RH Turn) For An Open
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : GO to J4.
- No : REPAIR the circuit in question. TEST the system for normal operation.
J4 CHECK THE MULTIFUNCTION SWITCH
- Carry out the multifunction switch component test. Refer to COMPONENT TESTING article .
- Is the multifunction switch OK?
- Yes : GO to J5.
- No : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
J5 CHECK FOR CORRECT GEM OPERATION
- Disconnect the GEM connectors.
- Check for:
  - Corrosion
  - Pushed-out pins
- Connect the GEM connectors and make sure they seat correctly. Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new GEM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. TEST the system for normal operation.