Headlights alternate on and off left and right daytime/high beam

1 - Heated washer nozzles, heated outside mirrors 10A
2 - Turn signal system 10A
3 - Illumination 5A
4 - License plate light 5A
5 - Comfort system 7.5A
6 - Central locking system 5A
7 - Back-up lights 10A
8 - Telephone system 5A
9 - ABS 5A
10 - Engine control, gasoline 10A
11 - Instrument cluster, shift lock 5A
12 - B+ (battery positive voltage) for DLC 7.5A
13 - Brake lights 10A
14 - Interior lights, with central locking 10A
- Interior lights, only 5A
15 - Instrument cluster, automatic transmission 5A
16 - A/C-clutch, electrical water pump 10A
17 - Door lock heater 7.5A
18 - Right headlight, high beam 10A
19 - Left headlight, high beam 10A
20 - Right headlight, low beam 15A
21 - Left headlight, low beam 15A
22 - Sidemarker lights, right 5A
23 - Sidemarker lights, left 5A
24 - Wiper system, washer pump 20A
25 - Fresh air blower, air conditioning 25A
26 - Rear window defogger 25A
27 - Daytime running lights 10A
28 - Fuel pump (FP) 15A
29 - Engine control, gasoline 15A
- Engine control, diesel 10A
30 - Sunroof 20A
31 - Automatic transmission 20A
32 - Engine control, injectors, gasoline 10A
- Engine control, injectors, diesel 15A
33 - Headlight washer system 20A
34 - Engine control 10A
35 - Trailer socket 30A
36 - Fog lights 15A
37 - Radio system 10A
38 - Luggage compartment light, central locking system 15A
39 - Emergency flasher system 15A
40 - Dual horn 20A
41 - Cigarette lighter, 12V power outlets 15A
42 - Radio system 25A
43 - Engine control 10A
44 - Heated seats 15A

Headlamps Inoperative - Low Beams

Step

Action

Value(s)

Yes

No

DEFINITION: This diagnostic procedure should only be used if the high beam headlamps are operating properly and the low beams are inoperative.

1

Did you perform the Headlights System Check?
--
Go to Step 2
Go to Headlight System Check

2

1. Turn the headlamp and panel dimmer switch to the ON position.
2. Move the headlamp dimmer switch to the LOW position.
3. Backprobe the headlamp dimmer switch connector with a J 35616-200 from cavity A to ground.

Does the test lamp light?
--
Go to Step 3
Go to Step 5

3

1. Remove the daytime running lamp relay.
2. Connect a J 35616-200 at cavity G5 to ground.

Does the test lamp light?
--
Go to Step 4
Go to Step 6

4

1. Re-install the daytime running lamp relay.
2. Backprobe cavity B at the high/low beam headlamp with the headlamp dimmer switch in the LOW position.

Does the test lamp light?
--
Go to Step 7
Go to Step 8

5

Replace the headlamp dimmer switch.

Is the repair complete?
--
Go to Headlight System Check
--

6

Repair the open in CKT 359 (PPL) between the headlamp dimmer switch and the daytime running lamp relay.

Is the repair complete?
--
Go to Headlight System Check
--

7

Replace the high/low beam headlamps.

Is the repair complete?
--
Go to Headlight System Check
--

8

1. Inspect for an open in CKT 12 (TAN) between the daytime running lamp relay and S120, repair as necessary.
2. Replace the daytime running lamp relay if no open was found in CKT 12 (TAN) between the daytime running lamp relay and S120.

Is the repair complete?
--
Go to Headlight System Check
--

No. Amps Circuits Protected 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38 7.5
15
10
7.5
(15)
(20)
_
10
7.5
7.5
10
10
10
7.5
7.5
10
10
20
15
7.5
20
_
_
(20)
20
20
(20)
15
15
20
(15)
20
20
7.5
7.5
10
7.5
30 Power Window Relay
Fuel Pump
ACG
ABS/VSA
Heated Seats*
Front Fog Lights*
Not used
Rear Wiper
ODS (Occupant Detection System)
Meter
SRS
Right Headlight High Beam
Left Headlight High Beam
Small Light (Interior)
Small Light (Exterior)
Right Headlight Low Beam
Left Headlight Low Beam
Main Headlight High Beam
Small Lights MAIN
TPMS
Headlight Low Beam
Not used
Not used
Moonroof*
Door Lock
Front Left Power Window
HAC Option
Rear Accessory Socket
Accessory
Front Right Power Window
Accessory Power Socket on the Center Table*
Rear Right Power Window
Rear Left power window
ACC Radio
ACC Key lock
HAC
Daytime Running Lights
Front Wiper * If equipped

Try disconnecting one of your headlights and click on the high beams. If it goes to high without any other problems, then the problem is in the other headlight high beam circuit. If all the lights go out, then the problem lies in the high beam circuit of the headlight you disconnected. You can verify this by reconnecting the first headlight and disconnecting the other one. There is most likely a short to ground in one of the high beam circuits.

If you have daytime running lights. That is, your headlights stay on automatically. You will need to check the daytime running light relays. There may be four of them to check. One of them grounds the high beams.

is located under the dashboard on the driver's side. The fuse label is attached under the steering column. If something electrical in your vehicle stops working, check for a blown fuse first. Below table outlines detail fuse number, its ampere and circuits protected.
No.
Amps
Circuits Protected
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
7.5 15 10 7.5 (15) (20) _ 10 7.5 7.5 10 10 10 7.5 7.5 10 10 20 15 7.5 20 _ _ (20) 20 20 (20) 15 15 20 (15) 20 20 7.5 7.5 10 7.5 30
Power Window Relay Fuel Pump ACG ABS/VSA Heated Seats* Front Fog Lights* Not used Rear Wiper ODS (Occupant Detection System) Meter SRS Right Headlight High Beam Left Headlight High Beam Small Light (Interior) Small Light (Exterior) Right Headlight Low Beam Left Headlight Low Beam Main Headlight High Beam Small Lights MAIN TPMS Headlight Low Beam Not used Not used Moonroof* Door Lock Front Left Power Window HAC Option Rear Accessory Socket Accessory Front Right Power Window Accessory Power Socket on the Center Table* Rear Right Power Window Rear Left power window ACC Radio ACC Key lock HAC Daytime Running Lights Front Wiper

1-heated washer nozzle, heated outside mirrors 10A 2-turn signal system 3-illumination 4-license plate light 5-comfort system 6-central locking 7-buck-up lights 8-telephone system 9-abs 10-engine control-gasoline 11-instrument cluster, shiftlock 12-B+ for DLC 13-brake lights 14-interior lights w/ central locking 15-instrument cluster,automatic transmission 16-a/c clutch, electrical water pump 17- door lock heater 18-right head light , high beam 19-left headlight ,high beam 20-right headlight ,low beam 21-left headlight low beam 22-sidemarker light, right 23-sidemarker light left 24- wiper system, washer pump 25-fresh air blower, air conditioning 26-rear window defogger 27- daytime running lghts 28-fue pump 29-engine control, gasoline/desel 30-sunroof 31-automatic transmission 32-injectors 33-headlight washer 34- engine control 35-trailer socket 36- foglights 37-radiosystem 38-luggage compartment lights, central locking system 39-emergency flasher 40-dual horn 41-cigaritte lighter 42- radio system 43- engine control 44-heated seats

Sounds like you need a bulb,the daytime running lights send power to the high beam wire so they look like low beam lights are on but really they are high beam lights running on low voltage.

Fuse #8, #18 and #22.

Below is a listing of which fuse corresponds with which circuit:

1 - 10 Amp - Transmission Controller, Gauges, Autostick
2 - 10 Amp - Right High Beam Headlight
3 - 10 Amp - Left High Beam Headlight
4 - 10 Amp - Radio, CD Player
5 - 10 Amp - Washer Motor
6 - 15 Amp - Power Outlet
7 - 20 Amp - Tail, License, Parking, Illumination Lights, Instrument Cluster
8 - 10 Amp - Airbag
9 - 10 Amp - Turn Signal Lights, Turn Signal/Hazard Indicator
10 - 15 Amp - Right Low Beam
11 - 20 Amp - High Beam Relay, High Beam Indicator, High Beam Switch
12 - 15 Amp - Left Low Beam Headlight
13 - 10 Amp - Fuel Pump Relay, Power Train Control Module
14 - 10 Amp - Cluster, Day/Night Mirror,Sunroof, Overhead Console, Garage Door Opener, Body Control Module
15 - 10 Amp - Daytime Running Light Module (Canada)
16 - 20 Amp - Fog Light Indicator
17 - 10 Amp - ABS Control, Back Up Lights, Daytime Running Lights, A/C Heater Control Cavity Fuse Circuits
18 - 20 Amp - Power Amplifier, Horn
19 - 15 Amp - Overhead Console, Garage Door Opener, Trunk, Overhead, Rear Reading, and Visor Vanity Lights, Trunk Release Solenoid, Power Mirrors, Power Door Locks, Body Control Module, Aspirator Motor
20 - 20 Amp - Brake Lights
21 - 10 Amp - Leak Detection Pump, Low Rad Relay, High Rad Relay, A/C Clutch Relay
22 - 10 Amp - Airbag
23 - 30 Amp - Blower Motor, ATC Power Module
24 - 20 Amp - Power Window Motors
25 - 20 Amp - Power Door Lock Motors, Power Seats

Dash lights were falsing ? I assume you mean pulsing .
driving lights come on ? daytime running lights or park lamps ,does the vehicle have daytime running lamps . Daytime running lamps module .
Daytime Running Lamps (DRL) Module (Headlamp Auto Control Module)
Mounted behind the radio and the HVAC control, left of the instrument panel compartment.

im a mechanic who owns a1995 pathfinder, had the same problem.your trouble is in your daytime running light module. try giving it a tap, bet they will come back on