Download Honda Civic Si 2003 Electrical Diagram Manual L4-1998cc 2.0L DOHC EP3 (i-VTEC) PGMFI PDF

Get the complete Honda Civic Si 2003 Electrical Diagram Manual L4-1998cc 2.0L DOHC EP3 (i-VTEC) PGMFI PDF for accurate vehicle electrical system troubleshooting and repairs. This detailed manual provides factory wiring diagrams, circuit layouts, connector information, component locations, and electrical specifications for the 2003 Honda Civic Si EP3 model. Ideal for technicians, mechanics, and DIY enthusiasts working on engine management, sensors, lighting, starting, charging, and PGMFI systems. Access reliable OEM electrical references to diagnose faults and maintain your Honda Civic Si efficiently.

MODEL COVERED:
Civic Si 2003, L4-1998cc 2.0L DOHC EP3 (i-VTEC) PGMFI

MANUAL CONTENTS:
1. Air Conditioning – Automatic A_C Circuit (Hybrid)
2. Air Conditioning – Heater Circuit (Except Hatchback)
3. Air Conditioning – Heater Circuit (Hatchback)
4. Air Conditioning – Manual A_C Circuit (Except Hatchback)
5. Air Conditioning – Manual A_C Circuit (Hatchback)
6. Anti-Lock Brakes – Except Hatchback amp Hybrid
7. Anti-Lock Brakes – Hatchback
8. Anti-Lock Brakes – Hybrid
9. Anti-Theft – Forced Entry Circuit (Except Hatchback amp Hybrid)
10. Anti-Theft – Forced Entry Circuit (Hatchback)
11. Anti-Theft – Forced Entry Circuit (Hybrid)
12. Anti-Theft – Immobilizer Circuit (Except GX amp Hybrid)
13. Anti-Theft – Immobilizer Circuit (GX)
14. Anti-Theft – Immobilizer Circuit (Hybrid)
15. Body Computer – Except Hatchback amp Hybrid
16. Body Computer – Hatchback
17. Body Computer – Hybrid
18. Computer Data Lines – Except Hatchback amp Hybrid
19. Computer Data Lines – Hatchback
20. Computer Data Lines – Hybrid
21. Cooling Fans – Except Hatchback amp Hybrid
22. Cooling Fans – Hatchback
23. Cooling Fans – Hybrid
24. Cruise Control – Except Hatchback amp Hybrid
25. Cruise Control – Hatchback
26. Cruise Control – Hybrid
27. Defogger – Rear Defogger Circuit (Coupe)
28. Defogger – Rear Defogger Circuit (Hatchback)
29. Defogger – Rear Defogger Circuit (Hybrid)
30. Defogger – Rear Defogger Circuit (Sedan)
31. Door Locks – Except Hatchback amp Hybrid
32. Door Locks – Hatchback
33. Door Locks – Hybrid
34. Electronic Power Steering – Hatchback
35. Electronic Power Steering – Hybrid
36. Engine Controls
37. Exterior Lights – Back-up Lamps Circuit (Except Hatchback amp Hybrid)
38. Exterior Lights – Back-up Lamps Circuit (Hatchback)
39. Exterior Lights – Back-up Lamps Circuit (Hybrid)
40. Exterior Lights – Exterior Lamps Circuit (Except Hatchback amp Hybrid)
41. Exterior Lights – Exterior Lamps Circuit (Hatchback)
42. Exterior Lights – Exterior Lamps Circuit (Hybrid)
43. Ground Distribution – Except Hatchback amp Hybrid
44. Ground Distribution – Hatchback
45. Ground Distribution – Hybrid
46. Headlights – Except Hatchback or Hybrid W_ DRL
47. Headlights – Except Hatchback or Hybrid W_O DRL
48. Headlights – Hatchback W_ DRL
49. Headlights – Hatchback W_O DRL
50. Headlights – Hybrid W_ DRL
51. Headlights – Hybrid W_O DRL
52. Horns – Except Hybrid
53. Horns – Hybrid
54. Instrument Cluster – DX, GX
55. Instrument Cluster – EX, HX, LX
56. Instrument Cluster – Hatchback
57. Instrument Cluster – Hybrid
58. Interior Lights – Courtesy Lamps Circuit (Coupe W_ Sunroof)
59. Interior Lights – Courtesy Lamps Circuit (Hatchback)
60. Interior Lights – Courtesy Lamps Circuit (Hybrid)
61. Interior Lights – Courtesy Lamps Circuit (Sedan W_ Sunroof)
62. Interior Lights – Courtesy Lamps Circuit (W_O Sunroof)
63. Interior Lights – Instrument Illumination Circuit (Except Hybrid)
64. Interior Lights – Instrument Illumination Circuit (Hybrid)
65. Mirrors – Heated Mirrors Circuit (Except Hatchback amp Hybrid)
66. Mirrors – Heated Mirrors Circuit (Hatchback)
67. Mirrors – Heated Mirrors Circuit (Hybrid)
68. Mirrors – W_ Defogger Except Hatchback amp Hybrid
69. Mirrors – W_ Defogger Hatchback
70. Mirrors – W_ Defogger Hybrid
71. Mirrors – W_O Defogger Except Hatchback amp Hybrid
72. Mirrors – W_O Defogger Hatchback
73. Mirrors – W_O Defogger Hybrid
74. Power Distribution – Except Hybrid
75. Power Distribution – Hybrid
76. Power Tops – Except Hatchback
77. Power Tops – Hatchback
78. Power Windows – Except Hatchback amp Hybrid
79. Power Windows – Hatchback
80. Power Windows – Hybrid
81. Shift Interlock – Except Hybrid
82. Shift Interlock – Hybrid
83. Sound Systems – Coupe
84. Sound Systems – Hatchback
85. Sound Systems – Hybrid
86. Sound Systems – Sedan
87. Starting_Charging – Charging Circuit (Hatchback)
88. Starting_Charging – Charging Circuit (W_O Hatchback)
89. Starting_Charging – Starting Circuit (Hatchback)
90. Starting_Charging – Starting Circuit (Hybrid)
91. Starting_Charging – Starting Circuit (W_O Hatchback)
92. Supplemental Restraints – Except Hatchback
93. Supplemental Restraints – Hatchback
94. Supplemental Restraints – Hybrid
95. Transmissions – A_T Circuit (Hybrid)
96. Transmissions – A_T Circuit (W_ CVT Except Hybrid)
97. Transmissions – A_T Circuit (W_O CVT)
98. Warning Systems – Except Hatchback amp Hybrid
99. Warning Systems – Hatchback
100. Warning Systems – Hybrid
101. Wiper_Washer – Front Wiper_Washer Circuit (Except Hatchback amp Hybrid)
102. Wiper_Washer – Front Wiper_Washer Circuit (Hatchback)
103. Wiper_Washer – Front Wiper_Washer Circuit (Hybrid)
104. Wiper_Washer – Rear Washer_Wiper Circuit
105. Brake Warning Indicator
106. Cargo Lamp
107. Cigarette Lighter
108. Circuit 11 Illumination (Positive)
109. Circuit 12 Illumination (Negative)
110. Circuit 13 Brake Pedal Position
111. Circuit 196 Key-In Ignition
112. Circuit 20 Tailgate Relay Control
113. Circuit 200 Hatch Latch Switch Position
114. Circuit 201 Passengers Door Switch
115. Circuit 202 Drivers Door Switch
116. Circuit 207 (Canada) Parking Brake Position
117. Circuit 207 (USA) Parking Brake Position
118. Circuit 21 Headlight Relay 1, 2
119. Circuit 331 Ground For Heater Control Sensors
120. Circuit 61 Horn Relay Control
121. Circuit D04 Power Source For ECM Control
122. Circuit Diagams
123. Circuit Diagram_001
124. Circuit Diagram_002
125. Circuit Diagram_003
126. Circuit Diagram_004
127. Circuit Diagrams_001
128. Circuit Diagrams_002
129. Circuit Diagrams_003
130. Circuit Diagrams_004
131. Circuit Diagrams_005
132. Circuit Diagrams_006
133. Circuit Diagrams_007
134. Circuit Diagrams_008
135. Circuit Diagrams_009
136. Circuit Diagrams_010
137. Circuit Diagrams_011
138. Circuit Diagrams_012
139. Circuit Diagrams_013
140. Circuit Diagrams_014
141. Circuit Diagrams_015
142. Circuit Diagrams_016
143. Circuit Diagrams_017
144. Circuit Diagrams_018
145. Circuit Diagrams_019
146. Circuit Diagrams_020
147. Circuit Diagrams_021
148. Circuit Diagrams_022
149. Circuit Diagrams_023
150. Circuit E09 Engine Speed Pulse
151. Circuit E93 Vehicle Speed Sensor Signal
152. Circuit F12 Fan Controls
153. Circuit F20 Sensor Ground For ECM Sensors
154. Circuit F28 Service Check Signal
155. Circuit F29 Service Check Signal
156. Circuit F55 Service Check Signal
157. Circuit Z20 Logic Ground
158. Condenser Fan
159. Console
160. Courtesy Lamp
161. Daytime Running Lamp
162. Diagram 10-0
163. Diagram 10-10
164. Diagram 10-11
165. Diagram 10-1a
166. Diagram 10-1b
167. Diagram 10-2
168. Diagram 10-3
169. Diagram 10-4
170. Diagram 10-5a
171. Diagram 10-5b
172. Diagram 10-6
173. Diagram 10-7
174. Diagram 10-8a
175. Diagram 10-8b
176. Diagram 10-9a
177. Diagram 10-9b
178. Diagram 23-0
179. Diagram 23-1
180. Diagram 23-2
181. Diagram 23-3
182. Diagram 23-4
183. Diagram 23-5
184. Diagram 23-6
185. Diagram 23-7
186. Diagram 23-8
187. Diagram Set 10 (Power Distribution)
188. Diagram Set 110 (Exterior Lights)
189. Diagram Set 114 (Interior Lights)
190. Diagram Set 115 (Entry Light Control System)
191. Diagram Set 120 (Power Windows)
192. Diagram Set 122 (Moonroof)
193. Diagram Set 130 (Keyless_Power Door Locks)
194. Diagram Set 132 (Immobilizer System)
195. Diagram Set 133 ((Security Alarm System (Honda Accessory))
196. Diagram Set 14 (Ground Distribution)
197. Diagram Set 141 (Power Mirrors)
198. Diagram Set 15 (Splice and Junction Connector Details)
199. Diagram Set 150 (Audio System)
200. Diagram Set 155 (Accessory Power Socket)
201. Diagram Set 20 (Ignition System)
202. Diagram Set 21 (Starting System)
203. Diagram Set 22 (Charging System)
204. Diagram Set 23 (Fuel and Emissions)
205. Diagram Set 31 (VTEC_VTC Control System)
206. Diagram Set 34 (Cruise Control)
207. Diagram Set 40 (Horn)
208. Diagram Set 44 (ABS (Anti-Lock Brake System))
209. Diagram Set 45 (EPS (Electrical Power Steering))
210. Diagram Set 47 (SRS (Supplemental Restraint System))
211. Diagram Set 50 (Multiplex Control System)
212. Diagram Set 60 (HVAC)
213. Diagram Set 63 (Fans)
214. Diagram Set 64 (Rear Window Defogger)
215. Diagram Set 73 (Lights-on, Key-In and Seat Belt Tensioners, Key Light Timer and Low Oil Pressure Indicator)
216. Diagram Set 80 (Gauges and Indicators)

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