TM-5-4210-249-13-P-1

TACTICAL FIRE FIGHTING TRUCK (TFF) MODEL M1142

TECHNICAL MANUAL; OPERATOR’S AND FIELD LEVEL MAINTENANCE MANUAL WITH REPAIR PARTS AND SPECIAL TOOLS LIST (INCLUDING DEPOT REPAIR PARTS AND SPECIAL TOOLS); PART 1 OF 4

TM-5-4210-249-13-P-1 - Page 391 of 1188

TM 5-4210-249-13&P-1

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DRAFT

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TFFT04822

Step 42.

Put crew cab air conditioner/ heater control panel switch to off position (WP 0008).

Turn

battery disconnect switch to OFF position (WP 0007).

Remove crew cab air

conditioner/heater control panel (WP 0202).

Turn battery disconnect switch to ON

position (WP 0007).

Check for 22 to 28 VDC at crew cab air conditioner/ heater relay

module block, crew cab air conditioner/heater blower relay white wire terminal.

If 22 to 28 VDC are not present, replace air conditioner/heater control

box (WP 0201).

Step 43.

Check for continuity across white wire terminal from crew cab air conditioner/ heater

control panel switch white wire terminal to crew cab air conditioner/ heater relay module

block, crew cab air conditioner/heater blower relay white wire terminal.

If continuity is not present, replace air conditioner controller wire

harness (WP 0433).

Step 44.

Turn battery disconnect switch to OFF position (WP 0007).

Check for continuity across

black wire terminal from crew cab air conditioner/ heater control panel switch to a

known good ground.

a.

If continuity is present, replace crew cab air conditioner/heater control

panel switch (WP 0202).

b.

If continuity is not present, replace air conditioner controller wire

harness (WP 0433).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION