Pinpoint Test A: ONE OR MORE MODULE-CONTROLLED ILLUMINATION SOURCE(S) IS INOPERATIVE

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK IF ONE OR MORE MODULE-CONTROLLED ILLUMINATION SOURCE(S) IS INOPERATIVE
- Turn the headlamps ON.
- Place the dimmer switch in the maximum brightness position.
- Is only one illumination component inoperative?
- Yes : If the DM100i or the CDX6 audio unit is inoperative, INSTALL a new audio unit, REFER to AUDIO UNIT .
  For all other individual sources inoperative, GO to A2.
- No : If the LH rear window control switch and the LH rear heated seat switch illumination controls are inoperative, GO to A4.
  If the LH front window control switch, the memory set switch, the LH front door lock control switch, and the exterior mirror control switch illumination controls are inoperative, GO to A6.
  
  If the RH front window control switch and the RH front door lock control switch illumination controls are inoperative, GO to A8.
  
  If the RH rear window control switch and the RH rear heated seat switch illumination controls are inoperative, GO to A10.
  
  If the steering wheel controls, the instrument panel dimmer switch, the headlamp switch, the message center switch, the instrument cluster, the adjustable pedal switch, the transmission selector lever, the traction control switch, the electronic park brake release switch, and the parking aid switch illumination controls are all inoperative, GO to A14.

A2 CHECK THE VOLTAGE CIRCUIT TO THE ILLUMINATION SOURCE IN QUESTION

Turn the headlamps OFF.
Disconnect the inoperative illumination source connector.
Turn the headlamps ON.
Place the dimmer switch in the maximum brightness position.

Measure the voltage between the suspect illumination source, harness side and ground as follows:

ILLUMINATION SOURCE CIRCUIT VOLTAGE SPECIFICATIONS

Connector and Pin	Circuit
Headlamp Switch C205-2	64S-LH26 (BU/BK)
Instrument Panel Dimmer Switch C206-3	64S-LE10 (BU/YE)
Clockspring C218b-1	64-LK18 (BU/RD)
Message Center C253-1	64S-GG25 (BU/OG)
Transmission Selector Lever Illumination C307-1	64S-LK21 (BU/BK)
Memory Set Switch C503-6	64S-AH27 (BU)
LH Front Window Control Switch C504a-4	64S-LH14 (BU)
LH Front Door Lock Control Switch C505-2	64S-LH28 (BU)
Exterior Mirror Control Switch C527-6	64S-LH50 (BU/YE)
RH Front Window Control Switch C604-2	64S-LH31 (BU/RD)
RH Front Door Lock Control Switch C605-2	64S-LH42 (BU/RD)
LH Rear Window Control Switch C701-4	64S-LH16A (BU/WH)
LH Rear Heated Seat Switch C722-5	64S-LH15 (BU)
RH Rear Window Control Switch C801-4	64S-LH33A (BU/BK)
RH Rear Heated Seat Switch C822-5	64S-LH32 (BU/RD)
Adjustable Pedal Switch C2089-2	64S-AL19 (BU/BK)
Navigation Audio Unit C2253a-3	64S-LK34 (BU/BK)
Traction Control Switch C3208-6	64S-LH45 (BU/OG)
Electronic Park Brake Release Switch C3218-1	64S-CG15 (BU/WH)
Parking Aid Switch C9011-6	64S-LH49 (BU/BK)
Instrument Cluster C220a-7	64S-LK29 (BU/RD)

Is the voltage greater than 10 volts?

Yes : GO to A3.
No : REPAIR the circuit(s) in question. TEST the system for normal operation.

A3 CHECK THE GROUND CIRCUIT TO THE ILLUMINATION SOURCE IN QUESTION

Key in OFF position.
Turn the headlamps OFF.

Measure the resistance between the suspect illumination source, harness side and ground as follows:

ILLUMINATION SOURCE CIRCUIT RESISTANCE SPECIFICATIONS

Connector and Pin	Circuit
Headlamp Switch C205-1	31-LH26 (BK)
Instrument Panel Dimmer Switch C206-5	10-LE10 (GY/BK)
Clockspring C218b-3	31S-PG1 (BK/BU) (premium and navigation audio) 31S-PG24 (BK/OG) (CDX6 audio)
Message Center C253-2	31-GG25 (BK)
Transmission Selector Lever Illumination C307-2	31-LK21 (BK/GN)
Memory Set Switch C503-5	31-AH27 (BK)
LH Front Window Control Switch C504a-8	31-AJ7 (BK/BU)
LH Front Door Lock Control Switch C505-4	31-LH28 (BK)
Exterior Mirror Control Switch C527-3	31-AD12 (BK/YE)
RH Front Window Control Switch C604-3	31-LH31 (BK)
RH Front Door Lock Control Switch C605-4	31-LH42 (BK)
LH Rear Window Control Switch C701-1	31-LH16 (BK/OG)
LH Rear Heated Seat Switch C722-1	31-HC15 (BK/YE)
RH Rear Window Control Switch C801-1	31-LH33 (BK/GN)
RH Rear Heated Seat Switch C822-1	31-HC18 (BK/GN)
Adjustable Pedal Switch C2089-1	31-AL19 (BK/GN)
Navigation Audio Unit C2253a-13, C2253a-24, C2253a-4.	31-MD15B (BK/GN), 31-MD15A (BK/GN), 31-LK34 (BK/GN)
Traction Control Switch C3208-5	31-LH45 (BK/WH)
Electronic Park Brake Release Switch C3218-2	31-CG15 (BK/OG)
Parking Aid Switch C9011-5	31-LH49 (BK/GN)

Is the resistance less than 5 ohms?

Yes : INSTALL a new component as necessary.
No : REPAIR the circuit in question. TEST the system for normal operation.

A4 CHECK CIRCUIT 64S-LH16A (BU/WH) FOR VOLTAGE
- Disconnect: LH Rear Window Control Switch C701.
- Turn the headlamps ON.
- Place the dimmer switch in the maximum brightness position.
- Measure the voltage between the LH rear window control switch C701-4, circuit 64S-LH16A (BU/WH), harness side and ground.
  
  Fig 1: Measuring Voltage Between LH Rear Window Control Switch C701-4, Circuit 64S-Lh16A (BU/WH) And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : REPAIR ground circuit 31-LH16 (BK/OG). TEST the system for normal operation.
- No : GO to A5.
A5 CHECK CIRCUIT 64S-LH16 (BU/WH) FOR AN OPEN
- Turn the headlamps OFF.
- Disconnect: Interior Auxiliary Junction Box C283b.
- Measure the resistance between the LH rear window control switch C701-4, circuit 64S-LH16A (BU/WH), harness side and the interior auxiliary junction box C283b-10, circuit 64S-LH16 (BU/WH), harness side.
  
  Fig 2: Measuring Resistance Between The LH Rear Window Control Switch C701-4, Circuit 64S-LH16A And Interior Auxiliary Junction Box C283b-10, Circuit 64S-LH16
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : REPAIR or INSTALL a new interior auxiliary junction box. TEST the system for normal operation.
- No : REPAIR the circuit. TEST the system for normal operation.
A6 CHECK CIRCUIT 64S-LH14 (BU) FOR VOLTAGE
- Disconnect: LH Front Window Control Switch C504a.
- Turn the headlamps ON.
- Place the dimmer switch in the maximum brightness position.
- Measure the voltage between the LH front window control switch C504a-4, circuit 64S-LH14 (BU), harness side and ground.
  
  Fig 3: Measuring Voltage Between LH Front Window Control Switch C504A-4, Circuit 64S-Lh14 (BU) And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : REPAIR circuit 31-LH1 (BK/BU) or 31-AJ7 (BK/BU). TEST the system for normal operation.
- No : GO to A7.
A7 CHECK CIRCUIT 64S-LH1 (BU/RD) FOR AN OPEN
- Turn the headlamps OFF.
- Disconnect: Interior Auxiliary Junction Box C283b.
- Measure the resistance between the LH front window control switch C504a-4, circuit 64S-LH14 (BU), harness side and the interior auxiliary junction box C283b-1, circuit 64S-LH1 (BU/RD), harness side.
  
  Fig 4: Measuring Resistance Between The LH Front Window Control Switch C504a-4, Circuit 64S-LH14 And The Interior Auxiliary Junction Box C283b-1, Circuit 64S-LH1
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : REPAIR or INSTALL a new interior auxiliary junction box. TEST the system for normal operation.
- No : REPAIR the circuit. TEST the system for normal operation.
A8 CHECK CIRCUIT 64S-LH31 (BU/RD) FOR VOLTAGE
- Disconnect: RH Front Window Control Switch C604.
- Turn the headlamps ON.
- Place the dimmer switch in the maximum brightness position.
- Measure the voltage between the RH front window control switch C604-2, circuit 64S-LH31 (BU/RD), harness side and ground.
  
  Fig 5: Measuring Voltage Between RH Front Window Control Switch C604-2, Circuit 64S-Lh31 (BU/RD) And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : REPAIR ground circuit 31-LH2 (BK/BU) or 31-LH31 (BK). TEST the system for normal operation.
- No : GO to A9.
A9 CHECK CIRCUIT 64S-LH2 (BU/RD) FOR AN OPEN
- Turn the headlamps OFF.
- Disconnect: Central Junction Box (CJB) C270d.
- Measure the resistance between the RH front window control switch C604-2, circuit 64S-LH31 (BU/RD), harness side and the CJB C270d-25, circuit 64S-LH2 (BU/RD), harness side.
  
  Fig 6: Measuring Resistance Between The RH Front Window Control Switch C604-2, Circuit 64S-LH31 And The CJB C270d-25, Circuit 64S-LH2
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A12.
- No : REPAIR the circuit. TEST the system for normal operation.
A10 CHECK CIRCUIT 64S-LH33A (BU/BK) FOR VOLTAGE
- Disconnect: RH Rear Window Control Switch C801.
- Turn the headlamps ON.
- Place the dimmer switch in the maximum brightness position.
- Measure the voltage between the RH rear window control switch C801-4, circuit 64S-LH33A (BU/BK), harness side and ground.
  
  Fig 7: Measuring Voltage Between RH Rear Window Control Switch C801-4, Circuit 64S-Lh33A (BU/BK) And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : REPAIR ground circuit 31-LH33 (BK/GN). TEST the system for normal operation.
- No : GO to A11.
A11 CHECK CIRCUIT 64S-LH33 (BU/BK) FOR AN OPEN
- Turn the headlamps OFF.
- Disconnect: Central Junction Box (CJB) C270d.
- Measure the resistance between the RH rear window control switch C801-4, circuit 64S-LH33A (BU/BK), harness side and the CJB C270d-26, circuit 64S-LH33 (BU/BK), harness side.
  
  Fig 8: Measuring Resistance Between The RH Rear Window Control Switch C801-4, Circuit 64S-LH33A And The CJB C270d-26, Circuit 64S-LH33
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A12.
- No : REPAIR the circuit. TEST the system for normal operation.
A12 CHECK CIRCUIT 64S-AD2 (BU/RD) FOR VOLTAGE
- Connect: CJB 270d.
- Disconnect: Interior Auxiliary Junction Box C283b.
- Turn the headlamps ON.
- Place the dimmer switch in the maximum brightness position.
- Measure the voltage between the interior auxiliary junction box C283b-11, circuit 64S-AD2 (BU/RD), component side and ground.
  
  Fig 9: Measuring Voltage Between Interior Auxiliary Junction Box C283B-11, Circuit 64S-Ad2 (BU/RD), Component Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to A13.
- No : REPAIR or INSTALL a new interior auxiliary junction box.
A13 CHECK CIRCUIT 64S-AD2 (BU/RD) FOR AN OPEN
- Turn the headlamps OFF.
- Disconnect: CJB C270d.
- Measure the resistance between the interior auxiliary junction box C283b-11, circuit 64S-AD2 (BU/RD), harness side and the CJB C270d-24, circuit 64S-AD2 (BU/RD), harness side.
  
  Fig 10: Measuring Resistance Between The Interior Auxiliary Junction Box C283b-11, Circuit 64S-AD2 And The CJB C270d-24, Circuit 64S-AD2
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : REPAIR or INSTALL a new CJB.
- No : REPAIR the circuit. TEST the system for normal operation.
A14 CHECK THE INTERIOR AUXILIARY JUNCTION BOX ILLUMINATION
- Disconnect: Interior Auxiliary Junction Box C283b.
- Turn the headlamps ON.
- Place the dimmer switch in the maximum brightness position.
- Measure the voltage between the interior auxiliary junction box C283b-9, circuit 64S-LH4 (BU/RD), component side and ground.
  
  Fig 11: Measuring Voltage Between Interior Auxiliary Junction Box C283B-9, Circuit 64S-Lh4 (BU/RD), Component Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to A15.
- No : REPAIR or INSTALL a new interior auxiliary junction box. TEST the system for normal operation.
A15 CHECK CIRCUIT 64S-LH4 (BU/RD) FOR AN OPEN
- Turn the headlamps OFF.
- Disconnect: Interior Auxiliary Junction Box C283a.
- Measure the resistance between the interior auxiliary junction box C283b-9, circuit 64S-LH4 (BU/RD), harness side and the interior auxiliary junction box C283a-13, circuit 64S-LH4 (BU/RD), harness side.
  
  Fig 12: Measuring the Resistance Between Interior Auxiliary Junction Box C283b-9, Circuit 64S-LH4 And The Interior Auxiliary Junction Box C283a-13, Circuit 64S-LH4
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A16.
- No : REPAIR the circuit. TEST the system for normal operation.
A16 CHECK THE INTERIOR AUXILIARY JUNCTION BOX FOR AN OPEN
- Disconnect: Interior Auxiliary Junction Box C283d.
- Measure the resistance between the interior auxiliary junction box C283a-13, circuit 64S-LH4 (BU/RD), component side and the interior auxiliary junction box C283d-13, circuit 64S-LK1 (BU/RD), component side; and between the interior auxiliary junction box C283a-13, circuit 64S-LH4 (BU/RD), component side and the interior auxiliary junction box C283a-5, circuit 64S-LK9 (BU/RD), component side.
  
  Fig 13: Measuring Resistance Between The Interior Auxiliary Junction Box C283a-13 Circuits, C283d-13 Circuits And C283a-5 Circuits
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : If the adjustable pedal switch, instrument cluster, message center, headlamp switch, instrument panel dimmer switch, steering wheel controls, and navigation audio unit (if equipped) illumination controls are inoperative, GO to A17.
  If the transmission selector lever, traction control switch, electronic park brake release switch, and parking aid switch illumination controls are inoperative, REPAIR circuit 64S-LK9 (BU/RD).
  
  If the transmission selector lever, cigar lighter, and traction control switch illumination controls are inoperative, REPAIR circuits 31-HA6 (BK/YE), 31-LK21 (BK/GN) and 31-DA1 (BK/YE). TEST the system for normal operation.
- No : REPAIR or INSTALL a new interior auxiliary junction box. TEST the system for normal operation.
A17 CHECK CIRCUIT 64S-LK1 (BU/RD) FOR OPEN
- Disconnect: Joint Connector 3 C224.
- Measure the resistance between the interior auxiliary junction box C283d-13, circuit 64S-LK1 (BU/RD), harness side, and the joint connector 3 C224-13, circuit 64S-LK1 (BU/RD), harness side.
  
  Fig 14: Measuring Resistance Between The Interior Auxiliary Junction Box C283d-13, Circuit 64S-LK1 And The Joint Connector 3 C224-13, Circuit 64S-LK1
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : REPAIR or INSTALL a new joint connector 3.
- No : REPAIR the circuit. TEST the system for normal operation.