Lighting System All Stop Light Do Not Illuminate

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT OPERATION

CHECK HARNESS AND CONNECTOR (OUT)

CHECK STOP LIGHT CONTROL RELAY ASSEMBLY (OUT)

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Check that the stop lights illuminate when the brake pedal is depressed.
   

   OK:

   The stop lights illuminate when the brake pedal is depressed.
   

1. Disconnect the A24 hydraulic brake booster (skid control ECU) connector.
   

2. Disconnect the A39 stop light control relay connector.
   

3. Disconnect the S4 or T1 center stop light assembly connector.
   

4. Disconnect the L3 or Y1 rear combination light assembly RH connector.
   

5. Disconnect the K4 or n1 rear combination light assembly LH connector.
   

6. Disconnect the K49 or L87 radio setting condenser connector.
   

7. Measure the resistance according to the value(s) in the table below.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A24-45 (STP2) - A39-8 (OUT)	Always	Below 1 Ω
   A24-45 (STP2) - Body ground	Always	10 kΩ or higher

1. Disconnect the S4 or T1 center stop light assembly connector.
   

2. Disconnect the L3 or Y1 rear combination light assembly RH connector.
   

3. Disconnect the K4 or n1 rear combination light assembly LH connector.
   

4. Disconnect the K49 or L87 radio setting condenser connector.
   

5. Measure the voltage according to the value(s) in the table below.
   

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   A39-8 (OUT) - Body ground	Brake pedal depressed	11 to 14 V