Possible Causes

Circuit (BR) short to voltage
Circuit (R/Y) short to voltage
Circuit (BR/W) short to voltage
Circuit (W/B) short to ground
Circuit (B/P) short to voltage
Headlamp switch
Instrument panel dimmer switch
SJB

PARKING, REAR AND LICENSE PLATE LAMPS ALWAYS ON PINPOINT TEST REFERENCE

PINPOINT TEST 2		THE PARKING, REAR AND LICENSE PLATE LAMPS ARE ALWAYS ON
STEP	INSPECTION		ACTION
1	CHECK THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCs) FROM THE SJB SELF-TEST Key OFF. Check the recorded results from the SJB self-test. Was DTC C1961 recorded?	Yes	Go to step 4.
1		No	Go to next step.
2	CHECK THE HEADLAMP SWITCH Disconnect: Headlamp switch 0918-103. Do the parking lamps continue to illuminate?	Yes	Go to next step.
2		No	Install a new headlamp switch. See MAIN LIGHT SWITCH . Clear the DTCs. Repeat the self-test.
3	CHECK CIRCUIT (W/B) FOR A SHORT TO GROUND Disconnect: SJB J-2280d. Measure the resistance between the headlamp switch 0918-103 pin 3, circuit (W/B), harness side and ground. Is the resistance greater than 10,000 ohms?	Yes	Go to step 9.
3		No	Repair circuit (W/B) for a short to ground. Clear the DTCs. Repeat the self-test.
4	CHECK CIRCUIT (BR) FOR A SHORT TO VOLTAGE Disconnect: SJB J-2280a. Do the front parking lamps continue to illuminate?	Yes	Repair circuit (BR) for a short to voltage. Test the system for normal operation.
4		No	Go to next step.
5	CHECK CIRCUIT (B/P) FOR A SHORT TO VOLTAGE Disconnect: SJB J-2280c. Do the rear parking lamps continue to illuminate?	Yes	Repair circuit (B/P) for a short to voltage. Test the system for normal operation.
5		No	Go to next step.
6	CHECK CIRCUIT (BR/W) FOR A SHORT TO VOLTAGE Measure the voltage between the trailer tow 0918-901 pin 2, circuit (BR/W), harness side and ground. Is any voltage present?	Yes	Repair circuit (BR/W) for a short to voltage. Test the system for normal operation.
6		No	Go to next step.
7	CHECK THE INSTRUMENT PANEL DIMMER SWITCH Connect: SJB J-2280a and J-2280C. Disconnect: Instrument panel dimmer switch 0918-802. Do the parking lamps continue to illuminate?	Yes	Go to next step.
7		No	Install a new instrument panel dimmer switch. See INSTRUMENT PANEL DIMMER SWITCH . Test the system for normal operation.
8	CHECK CIRCUIT (R/Y) FOR A SHORT TO VOLTAGE Disconnect: SJB J-2280c. Do the front parking lamps continue to Illuminate?	Yes	Go to next step.
8		No	Repair circuit (R/Y) for a short to voltage. Test the system for normal operation.
9	CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion pushed-out pins Connect all the SJB 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 SJB. See SMART JUNCTION BOX (SJB) . Test the system for normal operation.
9		No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.