Sourced from 1991 Accord Service Manual and first-hand knowledge.
Character # 1-3: Manufacturer Code & Vehicle Type:
JHM: Honda Motor Co., Japan, passenger
1HG: Honda of America, USA, passenger
Character # 4-6: Model Line:
CB7: Accord 2-door/4-door
CB9: Accord 5-door
Character # 7: Body & Transmission:
1: 2-door, 5-speed manual
2: 2-door, 4-speed automatic
5: 4-door, 5-speed manual
6: 4-door, 4-speed automatic
7: 5-door, 5-speed manual
8: 5-door, 4-speed automatic
Character # 8: Vehicle Grade (U.S. Models):
4: DX
5: LX
6: EX
8: SE
Character # 8: Vehicle Grade (Canadian Models):
4: DX LX
5: EX (4-door)
EX-R without A/C (2-door)
6: EX-R (4-door)
EX-R with A/C (2-door)
7: EX-R with ABS (4-door)
8: SE (4-door automatic)
Character # 9: Check digit:
Character # 10: Model Year:
L: 90
M: 91
N: 92
P: 93
Character # 11: Factory Code:
A: Ohio Factory, USA
C: Sayama Factory, Japan
Character # 12-17: Serial Number:
last 6 digits
Character # 1-3: Manufacturer Code & Vehicle Type:
JHM: Honda Motor Co., Japan, passenger
1HG: Honda of America, USA, passenger
Character # 4-6: Model Line:
CB7: Accord 2-door/4-door
CB9: Accord 5-door
Character # 7: Body & Transmission:
1: 2-door, 5-speed manual
2: 2-door, 4-speed automatic
5: 4-door, 5-speed manual
6: 4-door, 4-speed automatic
7: 5-door, 5-speed manual
8: 5-door, 4-speed automatic
Character # 8: Vehicle Grade (U.S. Models):
4: DX
5: LX
6: EX
8: SE
Character # 8: Vehicle Grade (Canadian Models):
4: DX LX
5: EX (4-door)
EX-R without A/C (2-door)
6: EX-R (4-door)
EX-R with A/C (2-door)
7: EX-R with ABS (4-door)
8: SE (4-door automatic)
Character # 9: Check digit:
Character # 10: Model Year:
L: 90
M: 91
N: 92
P: 93
Character # 11: Factory Code:
A: Ohio Factory, USA
C: Sayama Factory, Japan
Character # 12-17: Serial Number:
last 6 digits
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