NHTSA ID Number: 11028617
Manufacturer Communication Number: M1508
TSB/Document Date: 2026-02-06
Summary
SERVICE BULLETIN M1508 (REV C): 2009-2025 TRIKE PLATFORM - REVERSE MOTOR. PURPOSE: Revision C. To inform dealers of a running change for the new reverse motor (Part No. 83388-09C) for Trike models. As of January 28, 2020 all Trike platform vehicles will be manufactured using the new reverse motor. The new reverse motor will be used to replace reverse motor assemblies (Part No. 83388-09, 83388-09A,83388-09B) that have failed diagnostics. Refer to Table 3. This motor contains several improvements for better motor durability. A new procedure has been added, Refer to PINION EXTENDS BUT REVERSE MOTOR STALLS OR SPINS SLOWLY. REV C: Update Removal and Assembly (R&I) of the Solenoid. Updated: DISASSEMBLE, ASSEMBLE and Install Electrical Kit.
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TSB/Document ID: M1508
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-30
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL/PROPULSION SYSTEM
MFR Component System:
MFR Component Subsystem:
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1
(+)
(–)
(+)
(–)
Figure 24.
a. Yes. Replace RCM solenoid.
b. No. Go to Step 10.
10. RCM Ground Circuit Test
1.
Disconnect [245] and inspect connections.
2.
Test resistance between [245B] terminal 8 and [246B]
terminal 2 (TN/GY).
3.
Is resistance less than 0.5 Ω?
Figure 27.
a. Yes. Repair open between [251A] and [252A] (BK) wire.
b. No. Repair open between [252A] and starter (BK) wire.
13. Reverse Motor Solenoid Test
1177613
4
3
2
1
8
7
6
5
2
(+)
1
1.
Start engine.
2.
With reverse button pressed, test voltage between reverse
motor solenoid [249A] and ground.
(–)
Figure 25.
a. Yes. Replace RCM .
b. No. Repair open in (TN/GY) wire.
11. RCM Solenoid Control Circuit Open Test
1.
Turn IGN OFF.
2.
Disconnect RCM [245] and inspect connections.
3.
Test resistance between [246B] terminal 1 and [245B]
terminal 7 (TN/R).
M1508
13 / 23
3.
Is voltage greater than 10 V?
2.
1229481
Is voltage greater than 10 V?
1229474
(+)
(+)
(–)
(–)
Figure 28.
Figure 30.
a. Yes, without electrical kit. Replace reverse motor
solenoid.
a. Yes. Replace circuit breaker.
b. No. Repair open in (BK) wire between [252A] and
starter.
b. Yes, with electrical kit. Go to Step 23.
c. No. Go to Step 14.
16. Neutral Circuit Test
14. Reverse Motor Circuit Solenoid Test
1.
Verify transmission is in neutral.
1.
With reverse button pressed, test voltage between circuit
breaker [252B] and ground.
2.
Is neutral lamp functional?
2.
Is voltage greater than 10 V?
a. Yes. Go to Step 17.
b. No. See neutral lamp diagnostics.
1229485
17. Accessory Circuit Open Test
(+)
(–)
1.
Turn IGN OFF.
2.
Disconnect RCM [245] and inspect connections.
3.
Turn IGN ON.
4.
Test voltage between [245B] terminal 2 (R/Y) wire and
ground.
5.
Is voltage greater than 10 V?
1177621
4
3
2
1
8
7
6
5
(+)
(–)
Figure 29.
a. Yes. Repair open between [249A] and [252B] (BK) wire.
Figure 31.
b. No. Go to Step 15.
a. Yes. Go to Step 18.
15. Circuit Breaker Test
1.
With reverse button pressed, test voltage between circuit
breaker [252A] and ground.
14 / 23
b. No. Repair open in (R/Y) wire.
18. Ground Circuit Open Test
1.
Turn IGN OFF.
2.
Using TEST CONNECTOR KIT (PART NUMBER:
HD-41404), test resistance between RCM [245B] terminal
5 and ground (BK) wire.
M1508
3.
Is resistance less than 0.5 Ω?
6.
With reverse button pressed, test voltage between BOB
[78-3] terminal 4 and [78-2] terminal 18.
7.
Is voltage greater than 10 V?
1177625
4
3
2
1
8
7
6
5
(+)
1205667
(–)
HD-50390-1
Modular Break Out Box
ECM
HD-50390-4-P
[78-1]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Figure 32.
a. Yes. Go to Step 19.
[78-2]
b. No. Repair open in (BK) wire.
(+)
19. Backup Light Power Test
[78-3]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1.
Connect [245].
2.
Connect BREAKOUT BOX (PART NUMBER: HD-50390-1)
and BCM CABLE (PART NUMBER: HD-50390-2A) to wire
harness [242B], leaving [242A] disconnected.
3.
Verify BCM OVERLAY (PART NUMBER: HD-50390-2-P)is
in position on Breakout Box (BOB).
a. Yes. Go to Step 21.
4.
Start engine.
b. No. Replace RCM.
5.
With reverse button pressed, test voltage between BOB
terminal G2 and ground.
6.
Is voltage greater than 10 V?
1203511
(–)
Figure 34.
21. Reverse Activate Test
1.
Press reverse button two times, test voltage between BOB
[78-3] terminal 16 and ground.
2.
Is voltage between 4–6 V?
HD-50390-1
1205315
Modular Break Out Box
HD-50390-2-P
HD-50390-1
Modular Break Out Box
M4
M3
M2
M1
L4
L3
L2
L1
K4
K3
K2
K1
J4
J3
ECM
(+)
J1
H2
G4
G3
G2
G1
F4
F3
F2
F1
E4
E3
E2
E1
D4
D3
D2
B2
C4
B1
C3
A4
C2
A3
C1
A2
B4
B3
[78-2]
D1
[78-1]
J2
(–)
HD-50390-4-P
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