SS 1034028 New Cascadia Espar shutting off
when SSAM goes to sleep
New Cascadia Espar Auxiliary heater shutting off when SSAM goes to sleep
Applicable Vehicles
New Cascadia
Symptoms
Espar auxiliary heaters in combination with Optimized idle, key off position, will shut down when the SSAM
goes to sleep.
Issue
Current builds of all New Cascadia vehicles that have Espar auxiliary heaters and Optimized Idle (datacodes
001-234 and 689-077 respectively) will not allow the Espar heater to function with the ignition key in the off
position, once the SSAM has gone into sleep mode.
Case Study
Customers are requesting that the Espar auxiliary heater remains functional without arming Optimized Idle,
with the ignition key in the "off" position.
Solution
See the attached document for field modification instructions. Future builds will include an additional overlay to
the standard harness that will accomplish the same results.

1

New Cascadia Espar Circuit Modification

Retrofit for New Cascadia with Optimized Idle to include Espar heater
functionality during key off condition

New Cascadia Espar Circuit Modification

Existing design for the New Cascadia Espar heater functionality in
o i atio ith opti ized idle e ui es the key i the ON positio ,
with the intention of the optimized idle (OI) to be armed. If the Espar
heate is ope ated ith the key i the OFF positio , it ill ease to
function as soon as the SSAM goes into a sleep mode shortly after the
key is tu ed OFF . Custo e s a e u e tly keepi g the Espa heate
functioning by keeping a SSAM output active, such as an interior light.

New Cascadia Espar Circuit Modification
Key points to remember in this modification:
• Upon modification, all low voltage dropout of the Espar heater will be
controlled via fuse F40B for the Espar ECU low voltage programming.
The final step in this modification is to depopulate F40A in favor of
F40B.
• Current design is powered via fuse F40A for SSAM load shedding.
• Operators will need to remain vigilant of the condition of charge to
the vehicle batteries while using the Espar heater.

New Cascadia Espar Circuit Modification
Parts needed for this modification:
1 QTY suppression resistor equipped relay 23-11276-011 for VPDM
relay RE22 (spare relay 5)
1 QTY 3 amp fuse 23-12537-003 for VPDM position 40B
1 QTY relay 23-13265-012 for VPDM relay RE6
See slide 9 for the cable size and type suggested for this modification,
18/.8, designating 18 AWG or .8 MM2/1.02MM, with TXL jacketing. If a
different gauge of wire is being used, always select the next higher
available gauge size.

New Cascadia Espar Circuit Modification
Prior to beginning this modification task, be certain to have access to
the VPDM and SSAM system diagrams in the
New Cascadia Electrical Systems and Troubleshooting Manual
These are essential visual aids necessary to understand the circuit
mapping of the intended outcome of this modification.

New Cascadia Espar Circuit Modification

See the following slide for a schematic of the ESPAR circuitry prior to
modification. The 12V signal runs directly to the ESPAR heater from the
SSAM X9/6 on circuit 91S for operation only with the ignition key in the
ON positio , ia fuse F4 A fo the pa k ake i di ato o fi atio .
The e is o p o isio to u the ESPAR heate ith the key i the OFF
position.

New Cascadia Espar Circuit Modification

New Cascadia Espar Circuit Modification
See the following slide for a schematic of the ESPAR circuitry after
modification. There are now (2) relays in this circuit, RE6 and RE22. Note that
circuit 91S still originates from the SSAM X9/6, but now routes to the VPDM
RE22/optional relay 5 at cavity location J6/C10, for pin 86 of the relay coil.
With the key i the ON positio , RE
ill lat h to allo a V output o
J6/B9 pin 87 of the relay, which in turn supplies J4/G4 of the VPDM. From
here, the signal exits the VPDM on pin J4/G5 to complete the circuit. RE6 will
be latched open. Note that RE22 J6/D9 pin 30 is fed 12v ignition via VPDM
J4/H6, VPDM fuse 11.
With the key i the OFF positio , oth elays a d 4 e o e do a t.
Relay 6 is intentionally wired to be normally closed (NC) across pins 30 and
87A at rest. Circuit 91S out to the ESPAR controller is now powered via fuse
40B, which is powered by the BCA fuse 12, BAT 1, constant battery power.

New Cascadia Espar Circuit Modification

New Cascadia Espar Circuit Modification
Below is the SSAM X9/6 portion of circuit 91S that will need to
be opened to route to cavity J6/C10 of the VPDM for
RE22/optional relay 5 terminal 86:

New Cascadia Espar Circuit Modification
See 330 BOM content for installation print D66-05723-000 for
the location of the VPDM J4 and J6 connectors

New Cascadia Espar Circuit Modification
See the eComponents website for the terminals needed for
this modification

New Cascadia Espar Circuit Modification

New Cascadia Espar Circuit Modification

New Cascadia Espar Circuit Modification

New Cascadia Espar Circuit Modification
Simply follow the next (4) steps to locate the terminal part
numbers needed: