Pinpoint Test

1. Ignition OFF.
2. Apply the brake pedal and observe the stoplamps.

Are all the stoplamps inoperative? 

• Yes: REFER to Diagnostic Routine M: All The Stoplamps Are Inoperative .
• No: For the high mounted stoplamp, GO to 2  .

  For a rear stoplamp, GO to  4.

1. Disconnect: High Mounted Stoplamp.
2. While applying the brake pedal, measure:

   High Mounted Stoplamp			Ground
   C475			Ground
   Pin	Circuit	Measurement / Action	Pin	Circuit
   1	CLS52 (BN)		-	Ground

Is the voltage greater than 11 volts? 

• Yes: GO to 3  .
• No: REPAIR the circuit.

1. While applying the brake pedal, measure:

   High Mounted Stoplamp			High Mounted Stoplamp
   C475			C475
   Pin	Circuit	Measurement / Action	Pin	Circuit
   1	CLS52 (BN)		2	GD349 (BK/GY)

Is the voltage greater than 11 volts? 

• Yes: INSTALL a new high mounted stoplamp. REFER to High Mounted Stoplamp .
• No: REPAIR the circuit.

1. Disconnect: Inoperative Rear Lamp.
2. While applying the brake pedal, measure:

   Inoperative Rear Stoplamp			Ground
   Rear Lamp			Ground
   Connector-Pin	Circuit	Measurement / Action	Pin	Circuit
   Left C414-5	CLS52 (BN)		-	Ground
   Right C417-5	CLS52 (BN)		-	Ground

Is the voltage greater than 11 volts? 

• Yes: GO to 5  .
• No: REPAIR the circuit.

1. While applying the brake pedal, measure:

   Inoperative Rear Stoplamp			Inoperative Rear Stoplamp
   Rear Lamp			Rear Lamp
   Connector-Pin	Circuit	Measurement / Action	Connector-Pin	Circuit
   Left C414-5	CLS52 (BN)		Left C414-1	GD351 (BK/GN)
   Right C417-5	CLS52 (BN)		Right C417-1	GD351 (BK/GN)

Is the voltage greater than 11 volts? 

• Yes: GO to 6  .
• No: REPAIR the circuit.

1. Inspect the rear lamp jumper harness for an open.

Is the rear lamp jumper harness OK? 

• Yes: INSTALL a new rear lamp assembly. REFER to Rear Lamp Assembly .
• No: REPAIR or INSTALL a new rear lamp jumper harness.