TEST
ACTION
APPLICABILITY
1
WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH
AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILI-
TIES. ALWAYS VENT THE DCHA’s EXHAUST WHEN OPERATING THE
DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
PERSONAL INJURY OR DEATH.
WARNING: ALLOW THE DCHA ASSEMBLY TO COOL BEFORE PERFORM-
ING A COMPONENT INSPECTION/REPAIR/REPLACEMENT. FAILURE TO
FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
CAUTION: DO NOT PERFORM THIS TEST UNLESS DIRECTED HERE BY
THE CABIN HEATER PRE-TEST. ALWAYS PERFORM THE CABIN HEATER
PRE-TEST PRIOR TO PERFORMING ANY OTHER CABIN HEATER TEST
FOR THE RESULT TO BE VALID.
NOTE: If present, diagnose and repair DTC B1811 Heater Overheated and
any other conditions relating to overheating before diagnosing this DTC.
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Dosing Pump harness connector.
Turn the ignition on.
On MTC, set the Blend control to the max cool position.
On ATC, set the Driver temperature control to LO (max cool).
Turn the ATC’s or MTC’s Power switch off.
With the DRBIII
t
, erase Cabin Heater DTCs.
Start the engine.
Allow the engine to idle.
Turn the ATC’s or MTC’s Power switch on.
Turn the Blower control to the high speed position.
CAUTION: Do not activate the DCHA Field Mode Test with the engine off.
Failure to follow these instructions may result in internal damage to the
DCHA Heater Module.
NOTE: Do not disconnect the vehicle’s battery or the DCHA’s main power
supply while the DCHA is in operation or in run-down mode. Failure to
follow these instructions may result in excess emissions from the DCHA
during heater operation.
With the DRBIII
t
in Cabin Heater, Systems Tests, select Field Mode and press Enter.
The test will run for approx 8.5 minutes.
On MTC, set the Blend control to the max heat position. Upon completion of the Field
Mode Test, proceed as follows:
On ATC, set the Driver temperature control to HI (max heat). Upon completion of the
Field Mode Test, proceed as follows:
With the DRBIII
t
, read Cabin Heater DTCs.
Turn the Blower control off and turn the ATC’s or MTC’s Power switch off.
Turn the engine off.
Is DTC B1820 Dosing Pump Circuit: Short to Ground present?
All
Yes
→
Go To
2
No
→
Replace the Dosing Pump in accordance with the Service Infor-
mation.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
306
CABIN HEATER
B1820 DOSING PUMP CIRCUIT: SHORT TO GROUND —
Continued
Summary of Contents for Caravan 2003
Page 24: ...NOTES xxiv ...
Page 64: ...NOTES 40 ...
Page 65: ...7 0 DIAGNOSTIC INFORMATION AND PROCEDURES 41 ...
Page 1080: ...C O N N E C T O R P I N O U T S 1056 CONNECTOR PINOUTS ...
Page 1119: ...10 2 2 BASE AUDIO SYSTEM S C H E M A T I C D I A G R A M S 1095 SCHEMATIC DIAGRAMS ...
Page 1123: ...10 3 3 FRONT ATC RHD S C H E M A T I C D I A G R A M S 1099 SCHEMATIC DIAGRAMS ...
Page 1125: ...10 4 COMMUNICATION S C H E M A T I C D I A G R A M S 1101 SCHEMATIC DIAGRAMS ...
Page 1130: ...10 6 EXTERIOR LIGHTING S C H E M A T I C D I A G R A M S 1106 SCHEMATIC DIAGRAMS ...
Page 1136: ...10 9 INTERIOR LIGHTING S C H E M A T I C D I A G R A M S 1112 SCHEMATIC DIAGRAMS ...
Page 1143: ...10 10 7 REAR BLOWER MOTOR S C H E M A T I C D I A G R A M S 1119 SCHEMATIC DIAGRAMS ...
Page 1145: ...10 11 MEMORY SYSTEM S C H E M A T I C D I A G R A M S 1121 SCHEMATIC DIAGRAMS ...
Page 1146: ...10 12 OVERHEAD CONSOLE S C H E M A T I C D I A G R A M S 1122 SCHEMATIC DIAGRAMS ...
Page 1147: ...10 13 POWER DOOR LOCKS RKE S C H E M A T I C D I A G R A M S 1123 SCHEMATIC DIAGRAMS ...
Page 1150: ...10 16 POWER LIFTGATE SYSTEM S C H E M A T I C D I A G R A M S 1126 SCHEMATIC DIAGRAMS ...
Page 1155: ...10 20 VEHICLE THEFT SECURITY SYSTEM S C H E M A T I C D I A G R A M S 1131 SCHEMATIC DIAGRAMS ...
Page 1157: ...10 21 WIPERS FRONT AND REAR S C H E M A T I C D I A G R A M S 1133 SCHEMATIC DIAGRAMS ...
Page 1158: ...NOTES 1134 ...
Page 1160: ...11 2 PCI BUS LAB SCOPE PATTERN C H A R T S A N D G R A P H S 1136 CHARTS AND GRAPHS ...
