NHTSA ID Number: 11020396
Manufacturer Communication Number: IK2300034
TSB/Document Date: 2025-07-08
Summary
Title: eCE EV Bus Sealed Relay Kit
Countries:
CANADA, UNITED STATES Document ID: IK2300034
Availability:
ISIS, Bus ISIS, NotSIR
Revision:
1
Major System:
Created:
12/11/2024
Current Language: English
Last Modified: 6/10/2025
Other Languages: NONE
Author:
Viewed:
Eric George
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Title : eCE EV Bus Sealed Relay Kit
Applies To : 2022 - 8/31/24 eCE EV bus
CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
12/11/24 - Initial Article Release
6/10/2025 - Added Diode Suppressed Relay Kit Part Number and Updated Instructions.
DESCRIPTION
This document will provide component part numbers for replacing the EV bus underhood cowl relays with sealed relays.
SYMPTOMS
Faults and /or operations that are related to the EV bus underhood cowl relays which include the following:
Global Power A Relay
Global Power B Relay
Cabin Heat Relay
HVAC Relay
Air Dryer Valve Relay
SERVICE PARTS INFORMATION
Relay Location
Relay Kit PN
Global Power A
2527102C91
Global Power B
2527102C91
Cabin Heat Enable
2527102C91
2527102C91
Air Dryer
2522071C91
Notes
Diode
Suppressed
Diode
Suppressed
Diode
Suppressed
Diode
Suppressed
Resistor
Suppressed
Figure 1 : Relay Kit
DIAGNOSTICS:
Relay Locations are shown in Figure 2 below.
Figure 2: Underhood Cowl Relay Locations
Corrosion at the relay socket and on the relay terminals.
Figure 3: Corrsion Relay Socket and Relay Terminals
REPAIR STEPS
1. When replacing the cowl relays, the proper relay kit should be used as listed below.
Relay Terminal
Global Power A
Global Power B
Cabin Heat Enable
AC Enable
Air Dryer
85
16 VT
16 VT
16 VT
16 WH
18 WH
86
30
18 PK 18 RD
18 PK 16 RD
18 PK 16 RD
16 VT 16 RD
18 PK 12 RD
87
18 PK
16 PK
18 PK
16 PK
18 GY
Relay Type Kit Part number
Diode - 2527102C91
Diode -2527102C91
Diode - 2527102C911
Diode - 2527102C91
Resistor 2522071C91
2. Crimp and solder all connections.
3. Use the supplied heat shrink tubing to protect the connections.
4. Mount the new relay assembly in the same/ original location using the origninal screw
Figure 1 : Relay Kit
WARRANTY INFORMATION
Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.
Standard Repair Time(s):
Refer to the SRT Manual for Repair Times
OTHER RESOURCES
Master Service Information Site
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Copyright © 2025 Navistar
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TSB/Document ID: IK2300034
Replacement Service Bulletin Number:
MFR Communication Date: 2025-06-10
MFR Internal Campaign ID/Software Version: IK2300034
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STRUCTURE:BODY
MFR Component System:
MFR Component Subsystem:
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