Fault diagnosis

J21 HEATED REAR WINDSCREEN NOT WORKING

Engines: 2.0 16V, 2.0 JTD 8V, 2.3 JTD 16V, 2.8 JTD 8V

Engines: 2.0 16V
Equipment / version codes: Minibus [B33], Van [B34], Panorama [B36], Combi [B37]

The demisting function does not work when the button is pressed with the ignition on.

Engines: 2.0 16V
Equipment / version codes: Minibus [B33], Van [B34], Panorama [B36], Combi [B37]

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check fuse condition See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING	Move on to Step	Fuse blown	1. Replace the fuse and find out what could have caused it to blow
1	RESISTANCE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using a multimeter, check that the heated rear windscreen/mirror's resistance is not broken See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING	Move on to Step	1. Resistances broken at the heated rear windscreen(s)	1. Renew the resistance or replace the heated rear windscreen(s)
2	HEATED REAR WINDSCREEN HEATING RESISTANCES POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that there is an operating voltage for the resistances at the heated rear windscreen when the button in the switch control panel is pressed See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING	Move on to Step	No supply for resistances	Move on to Step
3	HEATED REAR WINDSCREEN RELAY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the heated rear windscreen relay is working properly See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING	Move on to Step	Heated rear windscreen relay defective	Replace the heated rear windscreen relay See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING
4	HEATED REAR WINDSCREEN/REAR VIEW MIRRORS DEMISTING ELECTRIC CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the following, in order: Connections between switch control panel and underfacia junction unit Connections between underfacia junction unit and heated rear windscreen(s) Heated rear windscreen earths	Move on to Step	1. Component defective	1. Replace the component
		Move on to Step	2. Connections interrupted	2. Repair the connections See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING
5	IGNITION SWITCH CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the ignition switch is operating correctly: particularly the heated rear windscreen relay feed See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING	Move on to Step	Ignition switch fault	Repair or replace the ignition switch Op. 5520A12 IGNITION SWITCH ASSEMBLY - R R FOR VERSIONS WITH AIR BAG
6	SWITCH CONTROL UNIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the following, in order: Correct power supplies/earths to switch control unit Check that an earth signal is generated to operate the heated rear windscreen relay when the rearscreen demisting button is pressed	Move on to Step	1. Power supplies/earths incorrect	1. Restore correct power supplies/earths See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING
		Move on to Step	2. Switch control panel defective	2. Replace switch control unit Op. 5505A24 W/L AND SERVICE SWITCH MOUNT - R+R
7	UNDERFACIA JUNCTION UNIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the following, in order: Correct underfacia junction unit power supply/earths Check that when an earth signal is activated from the switch control unit to the underfacia junction unit a battery voltage output is generated to operate the heated rear windscreen(s)	Move on to Step	1. Power supplies/earths incorrect	1. Restore correct power supplies/earths See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING
		Move on to Step	2. Underfacia junction unit defective	2. Replace the underfacia junction unit
8	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present