1990 CRX Electrical 
Troubleshooting Manual

Welcome to the on-line electrical reference manual for the 1990 (90 & 91 in most cases, 88-89 will have slight differences and should not use this manual) Honda CRX.  

If you would like to purchase a Honda service manual you can do so on-line at:  http://www.helminc.com for a cost of $35 plus shipping or from Honda - part number 61SH202-EL.   Important and commonly used sections are bolded.

1-1 Front Page
1-2    Circuit Index

2-1    How To Use This Manual
2-2    How To Use This Manual (Explanation of Symbols used in the manual)
            2-3, 2-4
2-6    How To Use This Manual (Explanation of Circuit Diagrams and how to read)
            2-7, 2-8, 2-9, 2-10
2-11    Component Location (Explanation)
2-12    How To Use This Manual (Five-Step Troubleshooting)
2-12    How To Use This Manual (Using test equipment)
                2-13
2-13    How To Use This Manual (Testing for voltage)
2-14    How To Use This Manual (Testing for continuity) 
2-14    How To Use This Manual (Testing for voltage drop)
2-15    How To Use This Manual (Testing for a short with a test light or voltmeter)
2-15    How To Use This Manual (Testing for a short with a self-powered test light or ohmmeter)
2-16    How To Use This Manual (Testing for a short with a short circuit tester)
2-17    Troubleshooting Precautions

6-0    Main Fuse Box - Under Hood (with fuse numbers and amp amounts)
6-1    Dash Fuse Box (with fuse numbers and amp amounts)

10-0    Major power lines with colors (Circuit Schematic)
                10-1, 10-2, 10-3
10-4    Power Distribution Component Location Index 
                10-5
11-0    Dash Fuse Box (Circuit Schematic)
                11-1, 11-2, 11-3, 11-4, 11-5, 11-6, 11-7, 11-8, 11-9, 11-10, 11-11
11-12    Dash Fuse Box (Component Location Index)
                11-13, 11-14

12-0    Headlight Switch (U.S. Models) Circuit Schematic
                12-1
12-2    Headlight Switch (Canadian Model) Circuit Schematic
                12-3, 12-4, 12-5
12-6    Headlight Switch Component Location Index

14-0    Ground Distribution: G101 (Std and DX)
                14-1
14-2    Ground Distribution: G151 (Si and HF) 
                14-3
14-4    Ground Distribution: G301 and G401
                14-5, 14-6, 14-7
14-8    Ground Distribution: G511 and G551
                14-9
14-10    Ground Distribution: G201, G281, G701 and G821
                14-11
14-12    Ground Distribution: G1 and G2
14-13    Ground Component Location Index
                14-14, 14-15

20-0    Ignition System (Circuit Schematic)
                20-1
20-2    Ignition System Component Location Index
20-3    Ignition System - How the circuit works

21-0    Starting System Circuit Schematic (diagram)
21-1    Starting System Component Location Index
21-2    Starting System - How the circuit works

22-0    Charging System Circuit Schematic (diagram)
                22-1
22-2    Charging System Component Location Index
22-3    Charging System  - How the circuit works
22-4    Charging System - Quick Check
22-4    Charging System - Troubleshooting Tree
                22-5, 22-6, 22-7, 22-8, 22-9

23-0    PGM-FI Circuit Schematic (Std and DX) - DPFI
                23-1, 23-2, 23-3, 23-4, 23-5, 23-6, 23-7, 23-8
23-9    PGM-FI Component Location Index
                23-10
23-10    PGM-FI - How the circuit works

24-0    PGM-FI Circuit Schematic (Si and HF) - MPFI
                24-1, 24-2, 24-3, 24-4, 24-5, 24-6, 24-7, 24-8
24-9    PGM-FI Component Location Index
                24-10
24-11    PGM-FI - How the circuit works

31-0    Coolant Fan:  Without Air Conditioning - Circuit Diagram
31-1    Coolant Fan:  Without Air Conditioning - Component Location Index
31-1    Coolant Fan:  Without Air Conditioning - How the circuit works

40-0    Horns - Circuit Diagram
40-1    Horns - Component Location Index
40-1    Horns - How the circuit works

61-0    Rear Windows Defogger - Circuit Diagram
61-1    Rear Windows Defogger - Component Location Index
61-1    Rear Windows Defogger - How the circuit works

62-0    Blower Control - Circuit Diagram
62-1    Blower Control - Component Location Index
62-1    Blower Control - How the circuit works
62-2    Blower Control - Quick Checks
62-2    Blower Control - Troubleshooting Tree
                62-3

63-0    A/C: Fans and Compressor Control: US Model - Circuit Diagram
                63-1
63-2    A/C: Fans and Compressor Control: Canadian Model - Circuit Diagram
                63-3
63-4    A/C: Fans and Compressor Control - Circuit Diagram
63-5    A/C: Fans and Compressor Control - Component Location Index
63-6    A/C: Fans and Compressor Control - How the circuit works
63-7    A/C: Fans and Compressor Control - Quick Checks
63-7    A/C: Fans and Compressor Control - Troubleshooting Tree
                63-8, 63-9, 63-10, 63-11

THE FOLLOWING ARE NOT CURRENTLY ONLINE

64-0    A/C: Air Delivery - Circuit Diagram
                64-1
64-2    A/C: Air Delivery - Component Location Index
64-2    A/C: Air Delivery - How the circuit works

70-0    Integrated Control Unit - Circuit Diagram
                70-1
70-2    Integrated Control Unit - Component Location Index
70-2    Integrated Control Unit - How the circuit works

71-0    Brake Warning System - Circuit Schematic
71-1    Brake Warning System - Component Location Index
71-1    Brake Warning System -  How the circuit works

72-0    Oil Pressure Warning System - Circuit Diagram
72-1    Oil Pressure Warning System - Component Location Index
72-1    Oil Pressure Warning System - How the circuit works

73-1    Seat Belt and Key-on Warning System - Circuit Diagram
                73-1
73-2    Seat Belt and Key-on Warning System - Component Location Index
73-3    Seat Belt and Key-on Warning System - How the circuit works

80-0    Indicators (Dash Lamps) - Circuit Schematic
                80-1, 80-2, 80-3
80-4    Indicators (Dash Lamps) - Component Location Index
80-4    Indicators (Dash Lamps) - How the circuit works

81-0    Gauges - Circuit Schematic
81-1    Gauges - Component Location Index
81-1    Gauges - How the circuit works

89-0    Shift Position Indicator - Circuit Schematic
89-1    Shift Position Indicator - Component Location Index
89-1    Shift Position Indicator - How the circuit works

91-0    Wiper/Washer - Circuit Schematic
91-1    Wiper/Washer - Component Location Index
91-1    Wiper/Washer - How the circuit works

92-0    Rear Wiper/Washer - Circuit Diagram
92-1    Rear Wiper/Washer - Component Location Index
92-1    Rear Wiper/Washer - How the circuit works

100-0    Headlights - Circuit Diagrams
100-1    Headlights - Component Location Index
100-1    Headlights - How the circuit works

103-0    Daytime Running Lights: Canadian Models - Circuit Diagram
                103-1, 103-2, 103-3
103-4    Daytime Running Lights: Canadian Models - Component Location Index
103-5    Daytime Running Lights: Canadian Models - How the circuit works

110-0    Front Side Marker Lights - Circuit Schematic
                110-1
110-2    Front Side Marker Lights - Component Location Index
110-2    Front Side Marker Lights - How the circuit works

110-4    Front Marker Lights - Circuit Schematic
110-5    Front Marker Lights - Component Location Index
110-5    Front Marker Lights - How the circuit works

110-6    Turn Signal and Hazard Lights - Circuit Schematic
                110-7, 110-8
110-9    Turn Signal and Hazard Lights - Component Location Index
110-9    Turn Signal and Hazard Lights - How the circuit works

110-10    Tail, Rear Side Marker and License Plate Lights - Circuit Schematic
110-11    Tail, Rear Side Marker and License Plate Lights - Component Location Index
110-11    Tail, Rear Side Marker and License Plate Lights - How the circuit works

110-12    Brake Lights - Circuit Schematic
110-13    Brake Lights - Component Location Index
110-13    Brake Lights - How the circuit work

112-0    Back Up Lights - Circuit Schematic
112-1    Back Up Lights - Component Location Index
112-1    Back Up Lights - How the circuit works

114-0    Dome and Hatch Lights -  Circuit Schematic
114-1    Dome and Hatch Lights - Component Location Index
114-1    Dome and Hatch Lights - How the circuit works

114-2    Cigarette Lighter - Circuit Schematic
114-3    Cigarette Lighter - Component Location Index
114-3    Cigarette Lighter - How the circuit works

117-0    Dash and Console Lights - Circuit Schematic
                117-1, 117-2
117-3    Dash and Console Lights - Component Location Index
117-3    Dash and Console Lights - How the circuit works

122-0    Sunroof - Circuit Schematic
122-1    Sunroof - Component Location Index
122-1    Sunroof - How the circuit works

138-0    Interlock System: US Models - Circuit Schematic
                138-1
138-2    Interlock System: US Models - Component Location
138-2    Interlock System: US Models - How the circuit works

146-0    Automatic Seat Belt: US Models Only - Circuit Schematic
                146-1, 146-2, 146-3
146-4    Automatic Seat Belt: US Models Only - Component Location
146-5    Automatic Seat Belt: US Models Only - How the circuit works

150-0    Stereo Sound System - Circuit Schematic 
150-1    Stereo Sound System - Component Location Index
150-1    Stereo Sound System - How the circuit works

154-0    Clock - Circuit Schematic
154-1    Clock - Component Location Index
154-1    Clock - How the circuit works

201-0    Component Location Photos
                201-1, 201-2, 201-3, 201-4, 201-5, 201-6, 201-7, 201-8, 201-9, 201-10
                201-11, 201-12, 201-13

202-0    Harness Connector Views:  Index for section 202
                202-1, 202-2, 202-3, 202-4, 202-5